JAEA-Testing-2011-007.pdf:46.74MB - 日本原子力研究開発機構
JAEA-Testing-2011-007.pdf:46.74MB - 日本原子力研究開発機構
JAEA-Testing-2011-007.pdf:46.74MB - 日本原子力研究開発機構
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(2) Radioactivity measurement methods<br />
<strong>JAEA</strong>-<strong>Testing</strong> <strong>2011</strong>-007<br />
<strong>JAEA</strong>-<strong>Testing</strong> <strong>2011</strong>-007<br />
There are several types of radioactivity measurement method, and each of these<br />
methods has its own merits and demerits. Here, we listed features of two typical<br />
types of detector, germanium (Ge) solid-state detector and sodium iodine (NaI)<br />
scintillation counter.<br />
Description<br />
Operability<br />
Accuracy<br />
Cost<br />
Other<br />
remarks<br />
Ge solid-state detector NaI(Tl) scintillation counter<br />
(Commercially available as<br />
・Place a sample cell on the<br />
detector within a radiation<br />
shield, and output signals are<br />
subjected to the pulse-height<br />
discriminator.<br />
・Operation by experts<br />
・Difficult to quantify at the site<br />
◎<br />
・Standard radiation<br />
measurement method<br />
・Superior energy discrimination<br />
capability<br />
・Detection limit (10 minutes<br />
measurement): < 30Bq/L<br />
・> 10 M Yen<br />
・10-20 thousands yen/sample<br />
when commissioned to<br />
specialized institutions (e.g.<br />
Institute of Radiation<br />
measurements)<br />
×<br />
- 184<br />
184<br />
-<br />
food monitor, etc.)<br />
・Place a sample cell on the<br />
detector within a radiation<br />
shield, and output signals are<br />
subjected to the pulse-height<br />
discriminator.<br />
・Some types are operable by<br />
non-expert operators<br />
・Standard radiation<br />
measurement method<br />
・Good energy discrimination<br />
capability<br />
・Detection limit (10 minutes<br />
measurement): < 60Bq/L<br />
・2-5 M Yen<br />
・Aloca: CAN-OSP-NAI<br />
・ORTC: FoodGurard-1TM ・Berthold: LB200,LB2045<br />
・OHYO KOKEN: FNF-401<br />
○<br />
○<br />
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