• Geiger
  • He elected to study beta radiation under Hans Geiger in Berlin. (wikipedia.org)
  • Using Geiger's recently developed Geiger counter, Chadwick was able to demonstrate that beta radiation produced a continuous spectrum, and not discrete lines as had been thought. (wikipedia.org)
  • He also coined the terms alpha, beta and gamma rays, he converted nitrogen into oxygen, and most importantly he supervised the students who did the Geiger-Marsden experiment (gold leaf experiment) which showed that the 'plum pudding model' of the atom was wrong. (wikipedia.org)
  • This article is about Geiger counters and Ion chamber instruments, and it uses the term "Geiger counter" as a colloquial name for any hand-held radiation measuring device in Civil defense. (wikipedia.org)
  • In cases of high-radiation fields, the Geiger tube can saturate, causing the meter to read a very low level of radiation (close to 0 R/h) hence the necessity of the companion ion-chamber survey meters. (wikipedia.org)
  • A much more modern and sophisticated device than earlier CD meters and equipped with a probe containing two Geiger-Mueller tubes of differing sensitivities, the CD V-718 can cover a much wider range of radiation levels than the earlier Geiger counters and ion-chamber survey meters combined (from .001mR/h to 10,000 R/h). (wikipedia.org)
  • This is a simple ion chamber radiological survey meter, specifically designed for high-radiation fields for which Geiger counters will give incorrect readings (see above). (wikipedia.org)
  • radioactive
  • ISO 21439:2009 is applicable to "sealed" radioactive sources, such as plane and concave surface sources, source trains of single seeds, line sources, shell and volume sources, for which only the beta radiation emitted is of therapeutic relevance. (iso.org)
  • Beta radiation reliably inhibits this process, but thrombosis is an essential condition for the efficacy of a radioactive coil strategy. (ahajournals.org)
  • 1 By varying coil caliber, number, and length and by studying coil-occluded arteries implanted with radioactive or nonradioactive stents, we confirm that recanalization is a potent biological process that can be reliably inhibited by beta radiation. (ahajournals.org)
  • A filament for irradiating a living body has a core material capable of irradiating radioactive radiation clad in a tubular casing of protective material different from the material forming the core. (google.ca)
  • Such a meter would not be expected to detect the presence of radiation except the very high levels that might be found in the event of a nuclear weapon detonation or a major release of radioactive material as from a nuclear reactor meltdown. (wikipedia.org)
  • The altitude of the explosion was important because a ground or near ground burst would produce radioactive fallout, whereas an air burst would produce only short distance and short lived initial radiations (but no fallout). (wikipedia.org)
  • emit
  • a first material adapted to emit radiation and a second material covering the first material wherein the first and second material each have a grain size equal to or less than about 30 μm. (google.ca)
  • dose
  • Recommendations are given for beta-radiation source calibration, dosemetry measurements, dose calculation, dosemetric quality assurance, as well as for beta-radiation brachytherapy treatment planning. (iso.org)
  • The RDX Radiation Delivery System is a "deployable balloon" source with the radioisotope 32P integrated into the balloon material at a dose of 20 Gy at 1 mm from the source. (acc.org)
  • Henri Becquerel had carried a sample of radium in his pocket and as a result he suffered a high localised dose which resulted in a radiation burn. (wikipedia.org)
  • A quartz fiber dosimeter, sometimes called a self indicating pocket dosimeter (SIPD) or self reading pocket dosimeter (SRPD), is a type of radiation dosimeter, a pen-like device that measures the cumulative dose of ionizing radiation received by the device, usually over one work period. (wikipedia.org)
  • restenosis
  • The specific dosemetric methods described in ISO 21439:2009 apply to sources for the curative treatment of ophthalmic disease, for intravascular brachytherapy treatment, for overcoming the problem of restenosis and for other clinical applications using beta radiation. (iso.org)
  • The goal of the Beta Radiation to reduce In-stent resTEnosis II (BRITE II) trial was to determine the safety and effectiveness of the RDX Coronary Radiation Delivery System for treatment of in-stent restenosis. (acc.org)
  • The RDX radiation balloon is a safe and effective method to treat in-stent restenosis. (acc.org)
  • Patients with in-stent restenosis were randomized to percutaneous transluminal coronary angioplasty (PTCA) and elective stenting with RDX radiation balloon (n=321) versus placebo (n=102). (acc.org)
  • Among patients with in-stent restenosis, treatment with the RDX beta radiation balloon following percutaneous coronary intervention (PCI) was associated with a reduction in the primary end point of MACE at nine months, and with a reduction in restenosis at nine-month angiographic follow-up. (acc.org)
  • No data with beta radiation for restenosis in saphenous vein grafts have been performed to date. (acc.org)
  • tumor
  • We investigated whether TGF-beta induced by anticancer therapies accelerates tumor progression. (nih.gov)
  • Using the MMTV/PyVmT transgenic model of metastatic breast cancer, we show that administration of ionizing radiation or doxorubicin caused increased circulating levels of TGF-beta1 as well as increased circulating tumor cells and lung metastases. (nih.gov)
  • Circulating polyomavirus middle T antigen-expressing tumor cells did not grow ex vivo in the presence of the TGF-beta antibody, suggesting autocrine TGF-beta is a survival signal in these cells. (nih.gov)
  • These data implicate TGF-beta induced by anticancer therapy as a pro-metastatic signal in tumor cells and provide a rationale for the simultaneous use of these therapies in combination with TGF-beta inhibitors. (nih.gov)
  • Preclinical studies have shown that tumor cell migration is stimulated by norepinephrine in a process mediated by beta-adrenergic receptors, suggesting a potential mechanism for a beneficial effect of beta-blocker use. (ascopost.com)
  • Other retrospective studies have indicated that beta-blockers may have antitumor activity, with reduced metastasis, tumor recurrence, and cancer-specific mortality being observed in breast cancer patients and increased survival being observed in melanoma patients. (ascopost.com)
  • therapeutic
  • The radiation emitted by phosphorus-32 can be used for therapeutic as well as diagnostic purposes. (wikipedia.org)
  • In this situation it is the longterm toxic effects of beta radiation from phosphorus-32 accumulating in the cancerous cells which has the therapeutic effect.The Phosphorus-32 is widely used radioisotope for cancer detection and treatment, especially in eyes and skin cancer. (wikipedia.org)
  • Meter
  • If the meter on any of the ion chamber devices are observed to respond at all to a radiation source, evacuation of the area should be considered. (wikipedia.org)
  • No legally exempt source of gamma radiation would be expected to cause any visible deflection of the meter on its most sensitive setting, so it might be assumed that such a radiation field could be dangerous. (wikipedia.org)
  • The Radiac Survey Meter No 2 or RSM was a 1955-meter which used an ionisation chamber to measure gamma radiation, it could measure beta, by removing the base-plate and opening the beta shield. (wikipedia.org)
  • The Radiac Survey Meter No 2 or RSM was a 1955-meter which measured gamma and beta radiation. (wikipedia.org)
  • biological
  • but a biological half-life of 623 days, according to Michigan State University's Office of Radiation, Chemical & Biological Safety. (forbes.com)
  • Biological Effects of External Beta Radiation (Zirkle, Raymond E.). Journal of Chemical Education. (wikipedia.org)
  • The radiation chemistry controls much of radiation biology as radiation has an effect on living things at the molecular scale, to explain it another way the radiation alters the biochemicals within an organism, the alteration of the biomolecules then changes the chemistry which occurs within the organism, this change in chemistry then can lead to a biological outcome. (wikipedia.org)
  • This injury resulted in the biological properties of radiation being investigated, which in time resulted in the development of medical treatments. (wikipedia.org)
  • high
  • Gamma radiation penetrates the sample material and the measuring vessel and is detected by the measuring instrument, mostly special semiconductor detectors (high-purity germanium detectors). (bfs.de)
  • survival
  • Another recently reported retrospective cohort study assessing the effect of beta-blocker use in hypertensive patients with a variety of cancers showed no effect on survival among the 436 patients with lung cancer included in the analysis. (ascopost.com)
  • On univariate analyses, Kaplan-Meier survival estimates indicated that beta-blocker use was associated with significantly improved distant metastasis-free, disease-free, and overall survival (all P ≤ .01). (ascopost.com)
  • clinical
  • The standardization of procedures in clinical dosemetry described in ISO 21439:2009 serves as a basis for the reliable application of beta-radiation brachytherapy. (iso.org)
  • Coronary
  • Two-thirds of patients taking beta-blockers did so for treatment of hypertension, with the remainder most frequently receiving beta-blocker treatment for coronary heart disease. (ascopost.com)
  • vessel
  • 1 We proposed to embolize aneurysms with coils ion-implanted with a predetermined linear activity of 32 P. 1,2 In addition to the aforementioned fundamental questions, this strategy raises practical issues: Should beta radiation be applied to the endothelium, to the vessel wall, or to the clot that forms over the surface and within the mesh of coils? (ahajournals.org)
  • Most or even all of the radiation is shielded by the sample material or the walls of the measuring vessel. (bfs.de)
  • chamber
  • They work by radiation penetrating the case of the unit and the enclosed ionization chamber to produce a visible reading between 0.1R/h and 500R/h (X0.1, X1, X10, and X100 scales). (wikipedia.org)
  • It works by measuring the decrease in electrostatic charge on a metal conductor in an ionization chamber, due to ionization of the air in the chamber by radiation. (wikipedia.org)
  • Scientists
  • Many scientists agree such tiny amounts of radiation pose no risk-except for those scientists who contend that all additional radiation poses additional risk . (forbes.com)
  • After Wilhelm Röntgen discovered X-rays by working on Tesla's pictures, many scientists began to work on ionizing radiation. (wikipedia.org)
  • detect
  • With highly specialized laboratories, the Federal Office for Radiation Protection ( BfS ) is able to detect radionuclides in virtually all media, such as water, soil, air and food. (bfs.de)
  • treatment
  • The analysis by Wang and colleagues included 722 patients with newly diagnosed NSCLC undergoing definitive radiation therapy at MD Anderson Cancer Center between 1998 and 2010, of whom 155 had received beta-blocker treatment during radiation therapy. (ascopost.com)
  • patients
  • Of patients receiving beta-blockers, the majority received selective beta-blockers, with 85% receiving metoprolol or atenolol. (ascopost.com)
  • work
  • After years of work recovering and analyzing old mission data and vehicle schematics, a just published analysis (Pdf) provides strong evidence for anisotropic thermal radiation being the source of the slowing of the Pioneer 10 and 11 spacecraft . (slashdot.org)
  • effect
  • Radiation failed to enhance lung metastases in mice bearing tumors that lack the type II TGF-beta receptor, suggesting that the increase in metastases was due, at least in part, to a direct effect of TGF-beta on the cancer cells. (nih.gov)
  • atomic
  • 19. The filament of claim 17, wherein the radiation emitting material is alloyed with 0.1 to 0.3 atomic percent of the biocompatible material, and the biocompatible material is alloyed with 0.1 to 0.3 atomic percent of the radiation emitting material. (google.ca)
  • He later joined the Atomic Energy Commission and was instrumental in the development of the preliminary regulations that became I0 CFR 20, Standards for Protection against Radiation. (wikipedia.org)