| Analysis of electret ion chamber radon detector response to 222Rn and interference from background gamma radiation. | |
| | |
MedLine Citation:
|
PMID: 9883946 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
|
Environmental radon (222Rn) monitors that incorporate electret detectors are confounded by background gamma radiation, which may cause the electret to discharge by as much as 7.5 volts per mR. Although background gamma corrections were formerly made by multiplying the known background gamma exposure rate with a constant conversion factor, this research demonstrates that doing so introduces an error ranging up to about 20%, especially in high gamma background areas. A new, more accurate method of background gamma correction has been developed that uses an average, voltage-dependent discharge factor, Dgamma (V Kg C(-1)). This factor and its coefficients were experimentally determined by separately exposing groups of electret radon detectors to photons from 60Co and 137Cs. Statistical analysis shows that Dgamma is independent of the orientation of the electret during irradiation but that some dependency on dose rate or energy of the irradiating photons may be expected. The discharge of the electret due only to gamma irradiation, Vgamma is determined by multiplying the total integrated gamma exposure by Dgamma. The discharge of the electret during a radon measurement can then be corrected for background gamma radiation by subtracting Vgamma from the total discharge of the electret resulting in a net discharge due solely to radon. A new equation has also been developed in this study for the radon discharge factor, D(Rn)(V m3 Bq(-1) s(-1)), that is entirely consistent with the gamma discharge factor and was thoroughly evaluated by exposing the electret radon detectors to known concentrations of radon. |
| | |
Authors:
|
S Usman; H Spitz; S Lee |
Related Documents
:
|
935226 - Effect of dimethylpolysiloxane fluid on the stability and dissolution of prednisolone. 9002786 - Toothbrushing duration and plaque removing efficacy of electric toothbrushes. 14621146 - Phosphorus removal in a vertical upflow constructed wetland system. 3823796 - Comparative evaluation of the effects of ultrasonic and ultraviolet irradiation on tiss... 17907076 - Effects of dehydration and fluid ingestion on cognition. 16860616 - An additive interaction between different qualities of dyspnea produced in normal human... |
Publication Detail:
|
Type: Journal Article |
Journal Detail:
|
Title: Health physics Volume: 76 ISSN: 0017-9078 ISO Abbreviation: Health Phys Publication Date: 1999 Jan |
Date Detail:
|
Created Date: 1999-01-21 Completed Date: 1999-01-21 Revised Date: 2000-12-18 |
Medline Journal Info:
|
Nlm Unique ID: 2985093R Medline TA: Health Phys Country: UNITED STATES |
Other Details:
|
Languages: eng Pagination: 44-9 Citation Subset: IM |
Affiliation:
|
University of Cincinnati Department of Mechanical, Industrial & Nuclear Engineering, OH 45221-0072, USA. |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
Air Pollution, Radioactive
/
analysis* Cesium Radioisotopes / analysis Cobalt Radioisotopes / analysis Gamma Rays* Models, Theoretical Photons Radiation Monitoring / instrumentation*, methods Radon / analysis* Regression Analysis Reproducibility of Results Sensitivity and Specificity |
| Chemical | |
Reg. No./Substance:
|
0/Cesium Radioisotopes; 0/Cobalt Radioisotopes; 10043-92-2/Radon |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: Contribution of 137Cs to the total absorbed gamma dose rate in air in a Greek forest ecosystem: meas...
Next Document: Relative radiosensitivity of bone tumor induction among beagles as a function of age at injection of...