Volume Reduction by the Incineration of the Combustible Radioactive Solid Samples from Radioisotope Usage at the Utilization Facility : Estimation of the Distribution of Low Energy β-Emitter Using the Imaging Plate

We want to establish a system of volume reduction by the incineration of the combustible radioactive solid wastes from radioisotope usage at the utilization facility. We have been performing experiments using an experimental incineration system to examine the distribution of radionuclides during incineration and to collect basic data. To reproduce the realistic conditions of incineration of low-level radioactive wastes in an experimental system, we adopted new incineration methods in this study. Low level radioactive samples (LLRS) were set up in a mesh container of stainless steel and incinerated at high temperature (over 800•Ž) generated by two sets of high calorie gas burners. Low energy ƒÀ-emitters 35S, 45Ca, 33P, and a high energy ƒÀ-emitter 32P were used for the experiment. Their translocation percentages in exhaust air and dust were estimated using the Imaging Plate. Distribution of radionuclides during the incineration was similar to that estimated by conventional methods by our study or to that reported in incineration of liquid scintillation cocktail waste. We concluded that the use of the Imaging Plates is a simple and reliable method for estimation of the distribution of low energy ƒÀ-emitters in incineration gas and ash.