β Scribed by Takao Kawano; Hiroshi Ebihara
No coin nor oath required. For personal study only.
The sum-peak method has been applied to determine the disintegration rates of two small [%o]Co sources (30 and 350 kBq) in lead contamers with several thicknesses (3, 6, 9, 15, 21, 27 and 33 mm) by usmg a NaI(T1) detector. The experimental results showed that the sum-peak method was perfectly effective for the determination of the disintegration rates (unrelated to the thicknesses of the containers) of the 350 kBq source. The sum-peak method was also absolutely effective for the 30 kBq source in the case of contamers with thicknesses of 15 mm and less, but in the cases of those with thicknesses of 21, 27 and 33 mm, the disintegration rates were under-estimated and the deviations from the true disintegration rate increased rapidly with Increasing thicknesses of the containers.
We presume that the under-estimation of the disintegration rates was the result of the over-estimation of the areas under the sum peaks, caused by the interference of the ;I-ray (2614 keV) emitted from the naturally occurring radionuclide 20sTl.
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