Radioactive decay rates. Medical search. Frequent questions

Not Ernö Rubik's latest toy, but the data from a four-year experiment to measure the half-life of the rare radioactive isotope silicon-32. (newscientist.com)
Each radioactive isotope of an element, including americium, constantly gives off radiation, which changes it into an isotope of a different element or a different isotope of the same element. (cdc.gov)
Specifically, the half-life is the time it takes for half of the atoms of a radionuclide to undergo radioactive decay and change it into a different isotope. (cdc.gov)
Findings showed a clear annual variation in the decay rate of a radioactive isotope called chlorine 36, with the highest rate in January and February and the lowest rate in July and August, over a period from July 2005 to June 2011. (spaceref.com)
The authors note that it's possible ASASSN-15lh got a luminosity boost from the radioactive isotope nickel-56. (smithsonianmag.com)
It is a radioactive isotope with a half-life of only 700 thousand years, so its presence means that the solar system formed within a few half-lives of the formation of ${}^{26}\mathrm{Al}$ in an exploding star. (stackexchange.com)
The rate of decay is often referred to as the activity of the isotope and is often measured in Curies (Ci), one curie = 3.700 x 1010 atoms that decay/second. (thenewsindependent.com)
U-235 is the ideal isotope for radioactive dating because of its lengthy half-life, especially for older fossils and rocks. (caribbeancricket.com)
Another radioactive isotope that transforms into C-12 is C-14. (caribbeancricket.com)
The simplest way to think of it is this: Some rock materials (isotopes) decay, and we can determine the age of a rock in today's laboratories by determining how much of a specific isotope contained in the rock has decayed. (icr.org)
Both the decaying isotope and the isotope it produces (its daughter) can be compared to an isotope of the daughter's elemental family that does not decay. (icr.org)
A radionuclide ( radioactive nuclide , radioisotope or radioactive isotope ) is a nuclide that has excess nuclear energy, making it unstable. (wikipedia.org)
Among those physical agents considered suitable for evaluation by the Monographs, and assigned high priority at that time, were electric and magnetic fields, the radioactive isotope iodine-131, and radioactive wastes. (who.int)

The early researchers also discovered that many other chemical elements, besides uranium, have radioactive isotopes. (wikipedia.org)
Alpha particle ( ionizing radiation ) - two neutrons and two protons bound as a single particle (a helium nucleus) that is emitted from the nucleus of certain radioactive isotopes in the process of disintegration. (cdc.gov)
Background radioactivity - radioactive elements in the natural environment including those in the crust of the earth (like radioactive potassium, uranium, and thorium isotopes) and those produced by cosmic rays. (cdc.gov)
Beta particle ( ionizing radiation ) - a charged particle emitted from the nucleus of certain unstable atomic nuclei (radioactive isotopes), having the charge and mass of an electron. (cdc.gov)
Radium does not degrade other than by radioactive decay at rates which are specific to each of four naturally-occurring isotopes. (cdc.gov)
Neptunium is also radioactive, so isotopes of this element also give off radiation and change into isotopes of other elements. (cdc.gov)
The U-238 series has 14 radioactive isotopes in secular equilibrium, thus each represents about 11 kBq/kg (irrespective of the mass proportion). (world-nuclear.org)
By enabling highly accurate dating of historical items and materials using a variety of scientific procedures, chronometric dating has transformed archaeology.Numerous creatures and minerals contain radioactive isotopes including U-235 and C-14. (caribbeancricket.com)
These radioactive isotopes decay over time at a predictable rate since they are unstable. (caribbeancricket.com)
For the purpose of dating rocks, artifacts, and fossils, a number of radioactive isotopes are frequently utilized. (caribbeancricket.com)

Radioactive decay is a stochastic (i.e. random) process at the level of single atoms. (wikipedia.org)
However, for a significant number of identical atoms, the overall decay rate can be expressed as a decay constant or as half-life. (wikipedia.org)
That's why we can tell the age of rocks, fossils and prehistoric artefacts by the activity of radioactive atoms within them, and why nuclear waste becomes less toxic over time. (newscientist.com)
Radiometric dating measures the decay of radioactive atoms to determine the age of a rock sample. (answersingenesis.org)
Scientists do not know how quickly unstable atoms decayed in the past. (answersingenesis.org)
So they usually assume the atoms decayed as slowly as they do today. (answersingenesis.org)
The system works by measuring differences in gamma radiation emitted when atoms in radioactive elements "decay," or lose energy. (spaceref.com)
thus carbon-14 is produced at a constant rate and the proportion of radioactive to non-radioactive carbon is constant: ca. 1 part per trillion (600 billion atoms/mole). (wikidoc.org)
Radioactivity is also the term used to describe the rate at which radioactive material emits radiation, or how many atoms in the material decay (or disintegrate) in a given time period. (nrc.gov)
Becquerel (Bq) is one of three units of measurement used to indicate radioactivity or how many atoms in the material decay or disintegrate in a specific amount of time. (thenewsindependent.com)
To find out how much material began the decay process long ago, we need to determine N 0 , the number of parent atoms present when the rock was formed. (icr.org)
So the equation in sidebar A guarantees deep time at today's decay rates, unless N (the number of parent atoms now) and N 0 are very close in magnitude. (icr.org)
Radioactive decay is a random process at the level of single atoms: it is impossible to predict when one particular atom will decay. (wikipedia.org)
The range of the half-lives of radioactive atoms has no known limits and spans a time range of over 55 orders of magnitude. (wikipedia.org)

Radioactive decay (also known as nuclear decay, radioactivity, radioactive disintegration, or nuclear disintegration) is the process by which an unstable atomic nucleus loses energy by radiation. (wikipedia.org)
A material containing unstable nuclei is considered radioactive. (wikipedia.org)
One of three units used to measure radioactivity , which refers to the amount of ionizing radiation released when an element (such as uranium ) spontaneously emits energy as a result of the radioactive decay (or disintegration) of an unstable atom . (nrc.gov)
This value refers to the amount of ionizing radiation released when an element (such as uranium) spontaneously emits energy as a result of the radioactive decay (or disintegration) of an unstable atom. (thenewsindependent.com)
The radioactive decay can produce a stable nuclide or will sometimes produce a new unstable radionuclide which may undergo further decay. (wikipedia.org)
Nuclei on both sides of the line of stability exist, but they are unstable and they will decay towards the line of stability. (lu.se)

The discovery of the natural radioactive decay of uranium in 1896 by Henry Becquerel, the French physicist, opened new vistas in science. (usgs.gov)
Both the curie (Ci) and the becquerel (Bq) tell us how much a radioactive material decays every second. (cdc.gov)

The decaying nucleus is called the parent radionuclide (or parent radioisotope), and the process produces at least one daughter nuclide. (wikipedia.org)
Activity - the mean number of decays per unit time of a radioactive nuclide expressed as disintegrations per second. (cdc.gov)
This newly formed nuclide may be stable or radioactive. (cdc.gov)
The daughter nuclide may be stable, or it may decay itself. (openstax.org)
The radiation produced during radioactive decay is such that the daughter nuclide lies closer to the band of stability than the parent nuclide, so the location of a nuclide relative to the band of stability can serve as a guide to the kind of decay it will undergo ( Figure 21.5 ). (openstax.org)
Figure 21.5 A nucleus of uranium-238 (the parent nuclide) undergoes α decay to form thorium-234 (the daughter nuclide). (openstax.org)
If the parent nuclide undergoing α decay lies below the band of stability (refer to Figure 21.2 ), the daughter nuclide will lie closer to the band. (openstax.org)
Gamma emission (γ emission) is observed when a nuclide is formed in an excited state and then decays to its ground state with the emission of a γ ray, a quantum of high-energy electromagnetic radiation. (openstax.org)

1) This chapter has been established to provide the requirements for the physical protection program for any licensee that possesses an aggregated Category 1 or Category 2 quantity of radioactive material listed in WAC 246-237-900 Appendix A: Table 1 - Category 1 and Category 2. (wa.gov)
2) WAC 246-237-021 through 246-237-057 apply to any person who, under the rules in this chapter, possesses or uses at any site an aggregated Category 1 or Category 2 quantity of radioactive material. (wa.gov)
b) Imports or exports a Category 1 or Category 2 quantity of radioactive material. (wa.gov)
3) "Aggregated" means accessible by the breach of a single physical barrier that would allow access to radioactive material in any form, including any devices that contain the radioactive material, when the total activity equals or exceeds a Category 2 quantity of radioactive material. (wa.gov)
Unit of radioactivity is defined as: The activity of a quantity of radioactive material where one decay takes place per second. (thenewsindependent.com)

As such, 1 Bq represents a rate of radioactive decay equal to 1 disintegration per second, and 37 billion (3.7 x 1010) Bq equals 1 curie (Ci) . (nrc.gov)
A Bq represents the rate of decay equal to one disintegration per second. (thenewsindependent.com)

Radon-222 (radon) is a naturally occurring radioactive gas and human carcinogen found in groundwater drinking supplies in some parts of North Carolina (NC) at levels that may pose a public health risk. (cdc.gov)
Radon is produced during the decay of uranium-238, an element common in many rocks throughout the Piedmont and mountains of NC. (cdc.gov)
These materials include decay products from radon and other natural radiation sources, as well as nuclear fallout. (blackcatsystems.com)
Radon is an inert gas, which is radioactive. (blackcatsystems.com)
The fan built into the unit pulls air through the filter, depositing radon decay products on the face of the filter. (blackcatsystems.com)
Take a look at the section on Radioactive Dust on this page for more details about radon. (blackcatsystems.com)
Only the readings from radon and decay products are amplified by the air sampler, the cosmic ray contribution stays the same. (blackcatsystems.com)
There are reasons for this, namely the cosmic ray and other background values are not exactly constant, and the radon daughters on the air sampler filter decay with various half lives, so there are always short time shifts between the readings. (blackcatsystems.com)
So the apparent gain in readings from radon and its decay products is 125. (blackcatsystems.com)
Radon is a naturally occurring radioactive gas that is created as part of the natural radioactive decay chain of uranium. (cdc.gov)
Radon is a naturally occurring radioactive gas that is created during the radioactive decay of uranium. (cdc.gov)
Radon gas that is created during radioactive decay of uranium is released into the surrounding soil. (cdc.gov)

During those processes, the radionuclide is said to undergo radioactive decay . (wikipedia.org)

At this point the closed system assumption was introduced and secularists assumed that all, or most, of the daughter nuclei present in a given material were there as a direct result of the parent's decay. (icr.org)
One can then estimate N 0 by setting it equal to the number of daughter nuclei plus the number of parent nuclei present at the current time, assuming no daughter nuclei were present at the beginning of the decay sequence. (icr.org)
Of course, one can never be sure that all the daughter nuclei came from the radioactive decay of the parent because the assumption of a closed system on or near Earth's crust for millions of years stretches credibility. (icr.org)
In implementing this approach, scientists assumed that the initial ratio of daughter nuclei will remain the same throughout the rock matrix where there are no parent nuclei- i.e., from the time of solidification until the present time, all daughter nuclei are produced only by decay of the parent nuclei in the sample being analyzed. (icr.org)

This section provides access to a number of visualizations and supporting material illustrating the concept of radioactive decay and its central role in radiometric dating. (carleton.edu)
No geologists have been observing the radiometric clocks for millions of years to check that the rate of radioactive decay has always been the same as the rate today. (answersingenesis.org)
The radiometric device detects associated radioactive minerals which are decay products of the uranium, rather than the uranium itself. (world-nuclear.org)

There are 28 naturally occurring chemical elements on Earth that are radioactive, consisting of 34 radionuclides (6 elements have 2 different radionuclides) that date before the time of formation of the Solar System. (wikipedia.org)
An imaging tracer made with radionuclides is called a radioactive tracer . (wikipedia.org)

Quantities of americium, as well as other radioactive elements, can be measured in units of mass (grams), but are usually measured in terms of their radioactivity (curies or becquerels). (cdc.gov)
About 95% of the radioactivity in the ore is from the U-238 decay series, totalling about 150 kBq/kg in ore with 0.1% U 3 O 8 . (world-nuclear.org)
However, with the removal of most U-238, the following two short-lived decay products in the uranium decay series (Th-234 and Pa-234) soon disappear, leaving the tailings with a little over 70% of the radioactivity of the original ore after several months. (world-nuclear.org)

In addition, radium is constantly being produced by the radioactive decay of its precursors, uranium, and thorium. (cdc.gov)
Uranium is radioactive and with time it decays to make another element, thorium. (sciencealert.com)

According to quantum theory, it is impossible to predict when a particular atom will decay, regardless of how long the atom has existed. (wikipedia.org)

They can then measure how much lead is present in a rock, and calculate how long it would take for uranium decay to produce that much lead. (creation.com)

A radioactive substance has a constant activity of 2000 disintegrations/minute. (toppr.com)
The material is separated into two factions, one of which has an initial activity of 1000 disintegrations per second while the other fraction decays with t 1 / 2 = 24 hours. (toppr.com)

Rutherford and his student Frederick Soddy were the first to realize that many decay processes resulted in the transmutation of one element to another. (wikipedia.org)
Only certain radioactive decay processes produce millions and billions of year ages, and if we change our assumptions, we can produce ages this way that match the biblical timescale. (creation.com)
The philosophy that processes have always occurred at roughly constant rates ('the present is the key to the past') is often called uniformitarianism . (creation.com)
Most decay quickly but can still be observed astronomically and can play a part in understanding astronomic processes. (wikipedia.org)

Beta decay, which can be thought of as the conversion of a neutron into a proton and a β particle, is observed in nuclides with a large n:p ratio. (openstax.org)

Rutherford was the first to realize that all such elements decay in accordance with the same mathematical exponential formula. (wikipedia.org)
The radioactive decay of carbon-14 follows an exponential decay . (wikidoc.org)
A quantity is said to be subject to exponential decay if it decreases at a rate proportional to its value. (wikidoc.org)
Word Problem Solving- Exponential Growth and Decay. (onlinemathlearning.com)
a) Assuming continuous exponential decay, find a formula of the form P 0 e kt for the worth of the company t years after 2010. (onlinemathlearning.com)
Write an exponential decay model for the value of the van and find the value of the van after 8 years. (onlinemathlearning.com)

Based on this plot, estimate the half-life of the decay. (pearson.com)
Half-life is the term that is used to describe the rate of the decay process. (cdc.gov)
U-235 has a half-life of 704 million years before decaying to Pb-207. (caribbeancricket.com)

The new detection technique is based on a hypothesis that radioactive decay rates are influenced by solar activity, possibly streams of subatomic particles called solar neutrinos. (spaceref.com)
Three of the most common types of decay are alpha decay (α-decay), beta decay (β-decay), and gamma decay (γ-decay), all of which involve emitting one or more particles. (thenewsindependent.com)

An example is plutonium-239 produced following neutron absorption by uranium-238 and subsequent decays of uranium-239 to neptunium-239 and then to plutonium-239. (cdc.gov)

The weak force is the mechanism that is responsible for beta decay, while the other two are governed by the electromagnetism and nuclear force. (wikipedia.org)
Except for gamma decay or internal conversion from a nuclear excited state, the decay is a nuclear transmutation resulting in a daughter containing a different number of protons or neutrons (or both). (wikipedia.org)
Nuclear War, First Responders Will Have To Wait For The Deadly Fallout To Decay Before They Enter A Hot Zone So The More You Prepare, The Better. (beforeitsnews.com)
A nuclear blast produces a blinding light, intense heat (called thermal radiation), initial nuclear radiation, 2 explosive shock waves (blasts), mass fires, and radioactive fallout (residual nuclear radiation). (beforeitsnews.com)
Both the initial nuclear radiation and residual nuclear radiation (also called radioactive fallout) are extremely dangerous. (beforeitsnews.com)
Radioactive fallout (residual nuclear radiation) is created when the fireball vaporizes everything inside it (including dirt and water). (beforeitsnews.com)
During the beginning of the twentieth century, many radioactive substances were discovered, the properties of radiation were investigated and quantified, and a solid understanding of radiation and nuclear decay was developed. (openstax.org)
Over one hundred experiments have been performed by the n_TOF Collaboration at CERN, with applications ranging from nuclear astrophysics (synthesis of the heavy elements in stars, big bang nucleosynthesis, nuclear cosmo-chronology), to advanced nuclear technologies (nuclear data for applications, nuclear safety) to basic nuclear science (structure and decay of highly excited compound states). (infn.it)

For example radioactive uranium naturally decays into lead. (creation.com)
Naturally occurring sources of radiation are cosmic radiation from space or naturally occurring radioactive materials in our body or in soil, air, water, or building materials. (cdc.gov)

Decay constants for radioisotopes typically used in deep-time dating range from 0.0654 × 10 -10 yr -1 for 147 Sm to 9.85 × 10 -10 yr -1 for 235 U. (icr.org)

Although the radioactive decay of a nucleus is too small to see with the naked eye, we can indirectly view radioactive decay in an environment called a cloud chamber. (openstax.org)
Alpha (α) decay is the emission of an α particle from the nucleus. (openstax.org)
Beta (β) decay is the emission of an electron from a nucleus. (openstax.org)

The decay of 7234Se by electron capture is illustrated in the fol. (pearson.com)
The decay of 72 34 Se by electron capture is illustrated in the following plot. (pearson.com)
In theory, only 146 of them are stable, and the other 105 are believed to decay via alpha decay , beta decay , double beta decay , electron capture , or double electron capture . (wikipedia.org)

Rate of decay of a radioactive body is proportional to its mass pressure that time. (toppr.com)
Another way would be to measure your rate of growth, e.g. measure how big you are now, and how big you are in exactly one year's time. (creation.com)
mean- or average-life: mean or average time each radiocarbon atom spends in a given sample until it decays. (wikidoc.org)
One of the indirect evidences that evolutionists universally appeal to is radioactive dating because it appears to supply the deep time their evolutionary models demand. (icr.org)
Radiocarbon dating is based on the radioactive decay of 14C in dead tissues, which can be used to calculate the time that has elapsed since death occurred. (lu.se)

A certain radioactive material is known to decay a rate proportional to the amount present. (toppr.com)
Are you saying that you have some radioactive material, and you want to make an asteroid out of it? (stackexchange.com)
Personnel access authorization requirements for Category 1 or Category 2 quantities of radioactive material. (wa.gov)
Requirements for criminal history records checks of individuals granted unescorted access to Category 1 or Category 2 quantities of radioactive material. (wa.gov)
Additional requirements for transfer of Category 1 and Category 2 quantities of radioactive material. (wa.gov)
Preplanning and coordination of shipment of Category 1 or Category 2 quantities of radioactive material. (wa.gov)
Advance notification of shipment of Category 1 quantities of radioactive material. (wa.gov)
These requirements provide reasonable assurance of the security of Category 1 or Category 2 quantities of radioactive material by protecting these materials from theft or diversion. (wa.gov)

Interest earnings are a type of "growth", but natural phenomena like temperature and radioactive decay change constantly, every second and faster. (betterexplained.com)

Three of the most common types of decay are alpha, beta, and gamma decay. (wikipedia.org)
The Purdue experimental setup consists of a radioactive source - manganese 54 - and a gamma-radiation detector. (spaceref.com)
As the manganese 54 decays, it turns into chromium 54, emitting a gamma ray, which is recorded by the detector to measure the decay rate. (spaceref.com)

detection of this decay meant that bismuth was no longer considered stable. (wikipedia.org)

The Air Sampler in effect increases the sensivity of the GM-45 geiger counter, allowing it to detect much smaller changes in radiation levels due to radioactive materials in the air. (blackcatsystems.com)
But as the materials decay or spread out radiation levels will drop. (beforeitsnews.com)

Actinides - radioactive elements with atomic numbers equal to or greater than that of actinium (i.e., 88). (cdc.gov)
Actinide elements are all radioactive. (cdc.gov)
The term background is also sometimes used in this report to indicate radioactive elements present in the environment that are not a direct result of SRS activities (e.g. atmospheric weapons testing fallout, see definition for fallout ). (cdc.gov)
Relief from fingerprinting, identification, and criminal history records checks and other elements of background investigations for designated categories of individuals permitted unescorted access to certain radioactive materials. (wa.gov)
Ionizing radiation is emitted by radioactive elements and by equipment such as x-ray and radiation therapy machines. (msdmanuals.com)

Subsequently, the radioactive displacement law of Fajans and Soddy was formulated to describe the products of alpha and beta decay. (wikipedia.org)
Once it dies, however, this exchange stops, and the amount of carbon-14 gradually decreases through radioactive beta decay . (wikidoc.org)
It decayed by emitting a beta particle (an electron), creating ${}^{26}\mathrm{Mg}$ (magnesium-26) and releasing energy. (stackexchange.com)

radiocarbon decay or disintegration constant . (wikidoc.org)

How to estimate the minimum radius of asteroid the rocky portion of which melted due to radioactive decay? (stackexchange.com)
I have been trying to estimate the minimum radius that the asteroid would need to have for it to melted due to radioactive decay but I do not know how this calculation is done. (stackexchange.com)
begingroup$ yes more specificly I read somewhere that one can estimate the minimum radius of an asteorid that experienced melting of its rocky portion due to radioactive decay of 26Al. (stackexchange.com)
a reasonable estimate for the heat production rate in the source is 3.9×10−6 W/m3. (ku.edu)

measuring the rate of some process, and the amount of product that process produces, and working out how long it would take to produce that amount of product at that rate of production. (creation.com)
Alternatively, you can measure the rate of change in a natural process, and calculate from that (method 3 above). (creation.com)
It goes through a long decay process until it finally becomes stable (non radioactive), emitting radiation at each decay stage along the way. (blackcatsystems.com)
This process is called radioactive decay. (cdc.gov)

A second hypothesis suggested that the size, distribution and geometry of individual grains affect how the energy absorbed from radiation is distributed amongst the grains, and therefore the rate at which charge accumulates in one mineral grain compared to another. (europa.eu)
If ${}^{26}\mathrm{Al}$ made up only $5 \times 10^{-5}$ ( $0.005\%$ ) of all the aluminum in a chondrite (most is aluminum-27, which is not radioactive), it would release enough energy to melt asteroids a few kilometers across and larger . (stackexchange.com)
assuming thatthat the mean rate of energy production of Al has a specific value. (stackexchange.com)
What is the unit of radioactive decay energy? (thenewsindependent.com)

Americium (pronounced, am-ə'ris(h)-ē-əm) is a human-made, radioactive element. (cdc.gov)

Suppose a radioactive substance decays at a rate of 3.5% per hour. (onlinemathlearning.com)

They must assume that all the lead came from uranium, that no uranium or lead entered or left the rock since it was formed, and that the rate of decay has remained constant. (creation.com)
It is founded on unprovable assumptions such as 1) there has been no contamination and 2) the decay rate has remained constant. (answersingenesis.org)
This rate of decay is widely believed to be constant, but recent findings challenge that long-accepted rule. (spaceref.com)
By knowing the amount of radioisotope and the activity of the sample, the rate constant can be determined. (thenewsindependent.com)

Corporate bonds: A bond with a face value of \$1000 and 5% interest rate (coupon) pays you \$50 per year until it expires. (betterexplained.com)

Understanding these concepts will help understand finance (mortgages & savings rates), along with the omnipresent e and natural logarithm . (betterexplained.com)

The dynamics of 137 Cs within forests represent information that is important because it not only captures the situation of the forest contamination but also clarifies our understanding and evaluation of the changes in the ambient dose rate in forests. (nature.com)
The Flexisource, an Ir-192 source manufactured by Nucletron, an Elekta company, is a source commonly used for high dose rate brachytherapy treatments. (cern.ch)
The geometry of the Flexisource was adapted from D. Granero, J. Pérez-Calatayud, E. Casal, et al, "A dosimetric study on the Ir-192 high dose rate Flexisource", Med. (cern.ch)
Details of the TG186 source may be obtained from Facundo Ballester, Åsa Carlsson Tedgren, Domingo Granero, et al, "A generic high-dose rate 192Ir brachytherapy source for evaluation of model-based dose calculations beyond the TG-43 formalism", Med. (cern.ch)
The user can compare the radial dose rate g(r) of the Flexisource and the Oncura sources calculated by means of the example to reference data. (cern.ch)
Ionizing radiation injures tissues variably, depending on factors such as radiation dose, rate of exposure, type of radiation, and part of the body exposed. (msdmanuals.com)

Jenkins, monitoring a detector in his lab in 2006, discovered that the decay rate of a radioactive sample changed slightly beginning 39 hours before a large solar flare. (spaceref.com)
Since then, researchers have been examining similar variation in decay rates before solar flares, as well as those resulting from Earth's orbit around the Sun and changes in solar rotation and activity. (spaceref.com)

How long does it take the last proton to decay? (thenewsindependent.com)
Some of the Grand Unified theories (GUTs) predict long-term proton instability between 1032 and 1038 years, with the upper bound on standard (non-supersymmetry) proton decay at 1.4×1036 years and an overall upper limit maximum for any proton decay (including supersymmetry models) at 6×1042 years. (thenewsindependent.com)

Air is drawn through the filter, and radioactive materials are captured on the filter surface. (blackcatsystems.com)
You must also consider the other chemicals or radioactive materials you're exposed to and your age, sex, diet, family traits, lifestyle, and state of health. (cdc.gov)
wait for the most dangerous radioactive materials to decay. (beforeitsnews.com)
Vaporized materials mix with radioactive materials in the updraft of air forming a mushroom cloud. (beforeitsnews.com)
Thus, geochronologists need a more reliable method of dating materials than the straightforward accumulation radioactive decay clock. (icr.org)

What is the measure of radioactive decay rate? (thenewsindependent.com)

That means that if we can increase the count rate, we can decrease the apparent variation from reading to reading, which is why the red curve, the one from the GM-45 with the air sampler, looks so much more smooth. (blackcatsystems.com)

You expect radioactive decay will produce heat. (stackexchange.com)

Chemicals and Drugs1

Phenomena and Processes3

Isotope13

Isotopes10

Atoms14

Unstable6

Becquerel2

Nuclide8

Quantity of radioactive material5

Disintegration per second2

Radon12

Undergo1

Nuclei4

Radiometric3

Radionuclides2

Radioactivity3

Thorium2

Particular atom will decay1

Uranium decay1

Disintegrations2

Processes4

Nuclides1

Exponential6

Half life3

Particles2

Neptunium-2391

Nuclear8

Naturally2

Constants1

Nucleus3

Electron capture3

Time5

Material8

Constantly1

Gamma3

Bismuth1

Radiation levels2

Elements5

Beta3

Radiocarbon1

Estimate4

Process4

Energy4

Element1

Substance1

Constant4

10001

Natural1

Dose rate6

Solar2

Long2

Materials5

Measure1

Variation1

Heat1