DocumentCode
1226308
Title
A highly selective monitor for air-borne iodine-125
Author
Holford, R.M.
Author_Institution
AECL, Chalk River, Ont., Canada
Volume
36
Issue
1
fYear
1989
fDate
2/1/1989 12:00:00 AM
Firstpage
1276
Lastpage
1279
Abstract
A description is given of an instrument which achieves high specificity for 125I with a standard sodium iodide scintillation detector, by using matched foils on indium and cadmium. An iodine-absorbing air filter is counted alternately through indium and cadmium. Only for 125I is there a significant difference in counting rate, due to the difference in k-edge energy for the two metals. The differential rate is averaged by a digital filter, and the 125I activity present is calculated and displayed. The air concentration of 125I is also estimated from the rate of change of the counting rate
Keywords
air pollution detection and control; iodine; radiation detection and measurement; radioactive pollution; radioisotopes; scintillation counters; sodium compounds; 125I; Cd; In; NaI detector; air concentration; air filter; airborne radioiodine; counting rate; differential rate; digital filter; highly selective monitor; k-edge energy; scintillation detector; Cadmium; Detectors; Indium; Instruments; Isotopes; Monitoring; Rivers; Tin; X-rays; Xenon;
fLanguage
English
Journal_Title
Nuclear Science, IEEE Transactions on
Publisher
ieee
ISSN
0018-9499
Type
jour
DOI
10.1109/23.34647
Filename
34647
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