PREPARATION OF REFERENCE MATERIALS ON RADIOCHEMICAL ANALYSIS FOR LOW

摘要

In order to prepare simulated reference materials of solidified products using a laboratory-scale electric furnace instead of a plasma heating device, melting tests of miscellaneous simulated solid wastes were conducted. Over 90% of Cs was remained in the solidified product by keeping the basicity (CaO wt% / SiO_2 wt%) to be 0.05. Under the optimum melting conditions, reference materials containing α-ray emitting nuclides (~(237)Np, ~(241)Am and ~(244)Cm) or y-ray emitting nuclides (~(60)Co, ~(137)Cs and ~(152)Eu) were prepared. For reference materials containing p-ray emitting nuclides such as ~(14)C and ~(36)C1, a preparation method with nuclear reaction ~(14)N(n, p)~(14)C or ~(35)C1(n, γ)~(36)Cl by thermal neutron irradiation was attempted. The radioactivity concentrations of the reference materials were evaluated from radiochemical analysis. It was confirmed that the reference materials could be successfully prepared on the present preparation methods.