Absolute radioactivity measurements by the use of a 4pibeta-4pigamma detector configuration
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Automated Radiochemical Synthesis of [18F]3F4AP: A Novel PET Tracer for Imaging Demyelinating Diseases
Published on: May 29, 2017
Yasushi Kawada1, Masashi Ohtuka, Qiu-Wei Wang
1Japan Radioisotope Association, 28-45 Honkomagome 2-cyome, Bunkyo-ku, Tokyo 113-8941, Japan. kawada@jrias.or.jp
Abstract:
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.
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