Up-to-date radon-thoron discriminative detector for a large scale survey
2005; American Institute of Physics; Volume: 76; Issue: 11 Linguagem: Inglês
10.1063/1.2132270
ISSN1527-2400
AutoresShinji Tokonami, Hiroyuki Takahashi, Yosuke Kobayashi, Weihai Zhuo, E. Hulber,
Tópico(s)Nuclear Physics and Applications
ResumoAn up-to-date radon-thoron discriminative detector has been developed for conducting a large scale survey. Comparing with our previous detector, some functional problems have been solved. The lowest and highest detection limits of the detector were estimated to be around 5 and 1000Bqm−3 for radon, and 15 and 1000Bqm−3 for thoron, respectively, with a 6month exposure and several theoretical assumptions. Small indoor survey were carried out in Japan and in Hungary using the present detector. The presence of thoron was demonstrated in any indoor surveys by the two results. Since any measurements without discrimination of radon isotopes will result in different risk estimates from actual situations, a special attention should be paid to thoron and its concentration should be accordingly measured as well as the radon concentration.
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