The response of a scintillation counter type survey meter was examined by using pulsed X-rays from an electron linear accelerator (LINAC), and it is confirmed that the survey meter indicates incorrect values due to the “pile-up effect”. In order to eliminate this weak point, a scintillation dose rate meter, which gives the value proportional to the dose rate of pulsed X-rays, was developed. The average value of the photoelectronic current proportional to the quantity of light generated in the scintillator by X-ray burst can be measured with this dose rate meter. To obtain a higher sensitivity dose rate meter, a 2“×2” NaI (T1) scintillator and a D. C. μ-ammeter were used, and the detection limit of X-ray intensity was 0.002mR/hr.
As an extension of the study of metal salt-ion exchange resins, previously reported elsewhere, one or more kinds of insoluble metal salts could be incorporated in one ion exchange resin matrix, by utilizing the residual ion exchange capacity of the resins. We named the products multi-loaded metal salt(s)-lon exchange resins. Multi-loaded metal salt(s)-ion exchange resins can be classified into two categories: (a) multi-loaded single metal salt-ion exchange resin, which contains only one metal salt in an ion exchange resin, and (b) multi-lcaded composite metal salts-ion exchange resin, which contains two or more different metal salts in a resin. It was found that the adsorption ability for cesium of multi-loaded nickel ferrocyanide-Amberlite IRA-904 increased linearly with the number of multiload treatment, and that simultaneous adsorption of cesium and strontium was possible by using nickel ferrocyanide-calcium phosphate-Amberlite IRA-904. This paper deals with the preparation of the resins and their applications in the fields of radiochemistry and health physics. Structure of the resins was also studied.
Nickel ferrocyanide-anion exchange resin (NiFC-R) and several metal ferrocyanide compounds were tested to compare their effectiveness for eliminating 137Cs from the body in mice. It was found that the NiFC-R was the most effective agent for the enhancement of 137Cs excretion among those tested in this experiment. Therefore, it may be considered that NiFC-R is an effective antidote in cases of accidental incorporation of 137Cs.