Internal dose estimation for inhalation of insoluble particles

Manabe, Kentaro   ; Matsumoto, Masaki*

It is expected that radioactivity included in matrix of an insoluble particle incorporated into the body will move stochastically as a single particulate material without dissolving to blood or tissue fluid. Therefore, a deterministic dosimetric method which is commonly used and is designed for the average behavior of large number of nuclei cannot be applied for estimation of uncertainty of internal doses depending on the stochastic movements of insoluble particles. The authors developed a method simulating a stochastic movement of insoluble materials inhaled into the body, and this method enables to estimate the probability density function (PDF) of internal doses from the particles. In this presentation, results and interpretation of PDFs will be reported in case of inhalation of typical insoluble cesium bearing particles. In addition, the difference will also be discussed between the pdf and a dose estimated by a commonly used method.