Title :
A highly selective monitor for air-borne iodine-125
Author_Institution :
AECL, Chalk River, Ont., Canada
fDate :
2/1/1989 12:00:00 AM
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;
Journal_Title :
Nuclear Science, IEEE Transactions on
