Background γ-ray spectra and54Mn spectra were measured with a Ge detector in a low-background shielding using various inner linings; Lucite, Al, Fe, Cu and Pb. The experimental results show that the background counting rate in the energy region 0-500 keV and backscattered γ ray increase in a shielding with low Z linings, It can be qualitatively understood through a simple calculation considering the γ-ray absorption and scattering processes in the shielding material.
This study was focussed our attention on the measurement within the upper physiological level of human serum parathyroid hormone (PTH), using kits of human PTH 53-84. This assay kit was able to detect serum PTH in sera with suble changes of sesum calcium concentrations before and after short term exercise. These serum PTH levels before and after exercise seemed to be changed within the upper physiological levels of PTH. Thus, this study suggested that the assay kit was likely to become a useful tool of the measurement of the physiological level of serum PTH in humans.