Absolute radioactivity measurements by the use of a 4pibeta-4pigamma detector configuration.
The radioactivity of 60Co and 134Cs sources were measured using a 4pibeta-4pigamma detector configuration with a well-type NaI(Tl) crystal and a sandwich type 4pibeta detector composed of two sheets of NE102A plastic scintillator coupled to a slender photomultiplier tube. The beta-detector was inserted into the well of the gamma-detector. Since counting efficiencies in both the beta- and gamma-channels can be kept high, excellent counting statistics were attainable even when weak sources were measured. This configuration can also be used for radioactivity measurements based upon the direct integral counting of 4pibeta + 4pigamma logic sum signals, and two independent results can be obtained for every measurement. This technique is especially useful for the standardization of complex decaying nuclides.
Japan Radioisotope Association, 28-45 Honkomagome 2-cyome, Bunkyo-ku, Tokyo 113-8941, Japan. kawada@jrias.or.jp
Yasushi
Y
Kawada
Masashi
M
Ohtuka
Qiu-Wei
QW
Wang
Yoshio
Y
Hino
D001610:Beta Particles; D002588:Cesium Radioisotopes / Q000032:analysis*; D003037:Cobalt Radioisotopes / Q000032:analysis*; D004867:Equipment Design; D019544:Equipment Failure Analysis / Q000379:methods* / Q000592:standards; D005720:Gamma Rays; D012015:Reference Standards; D015203:Reproducibility of Results; D012588:Scintillation Counting / Q000295:instrumentation* / Q000379:methods / Q000592:standards*; D012680:Sensitivity and Specificity; D013051:Spectrometry, Gamma / Q000295:instrumentation / Q000379:methods / Q000592:standards; D014159:Transducers
D002588:Cesium Radioisotopes; D003037:Cobalt Radioisotopes