Ijiri K, Endo M, Osaki S, Nogawa N, Tsuda S, Nakamura A, Morikawa N
Radioisotope Center, University of Tokyo, Japan.
Radioisotopes. 1990 Sep;39(9):400-3. doi: 10.3769/radioisotopes.39.9_400.
"Ready Cap", a small plastic container coated with solid scintillator has recently been introduced (Beckman Instruments, Inc.). Pulse height spectra and counting efficiencies obtained with a liquid scintillator and Ready Cap using a liquid scintillator counter were compared for 15 different radionuclides. For radionuclides emitting low-energy beta-rays or characteristic X-rays, the spectra for Ready Cap shifted toward the higher energy side compared with the spectra for the liquid scintillator. This tendency was reversed for the nuclides emitting higher-energy beta-radiations (36Cl and 32P). Generally, counting efficiencies both in Ready Cap and in liquid scintillator increased with increase in the energy of beta- or X-rays. For some nuclides, Ready Cap gave higher counting efficiencies and for others it gave lower values than in the liquid scintillator. However, the differences were not large within each nuclide. The use of Ready Cap is recommended for measurements of radionuclides when liquid scintillation cocktails have no means of waste disposal under the present Japanese radioisotope regulation.
“Ready Cap”是一种涂有固体闪烁体的小塑料容器，最近已被推出（贝克曼仪器公司）。使用液体闪烁计数器，对15种不同的放射性核素比较了用液体闪烁体和Ready Cap获得的脉冲高度谱和计数效率。对于发射低能β射线或特征X射线的放射性核素，与液体闪烁体的谱相比，Ready Cap的谱向更高能量侧移动。对于发射更高能量β辐射（36Cl和32P）的核素，这种趋势则相反。一般来说，Ready Cap和液体闪烁体中的计数效率都随着β射线或X射线能量的增加而增加。对于一些核素，Ready Cap给出的计数效率更高，而对于另一些核素，它给出的值比液体闪烁体中的低。然而，每种核素内的差异并不大。根据日本现行放射性同位素规定，当液体闪烁混合液没有废物处理方法时，建议使用Ready Cap来测量放射性核素。
