The Detection of Low Activity in Aqueous Solution Using Cerenkov Radiation
1962 年 17 巻 5 号 p. 865-869
詳細
1962 年 17 巻 5 号 p. 865-869
A method by which 90Sr activity in water can be detected at a concentration of about 10−7μ c/cc has been obtained by using Cerenkov radiation from the water itself. For detecting such a low activity, a large detecting volume is required. Cerenkov radiation is very effective for the purpose, because the path length of Cerenkov radiation induced by beta ray is extremely large (about 15 cm for 32P beta ray) as compared with that of the beta ray in water. In the experimental apparatus having a 8 litre detecting volume, the background was found to be 420 cpm with a normal statistical fluctuation. The minimum activity level that can be detected reliably under the presence of the background was 8×10−8μ c/cc for 90Sr.
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