A HYDROLOGIC APPROACH RELATING TO THE INFLUENCES OF RADIOACTIVE SUBSTANCE IN A HUMAN BODY

摘要

This study proposes a method to calculate absorbed dose emerged from radioactive substances in a human body. Previous research by specialists of radiology is too difficult and complex for non-specialists to understand. This study aims to arrive at simple understanding related to internal exposure by ingestion for general scientist and engineers. Emitted energy per radioactive decay is calculated from decay schemes and energy spectrum of β~- decay related to individual nuclides. Accuracy of the method is proved by comparison with previously proposed method. Absorbed dose is calculated from emitted energy and total exposure dose. A coefficient of committed effective dose is calculated from absorbed dose. The calculated values are compared with those determined by previous research. Majority of nuclides are similar, the method indicates equal accuracy with previous research. Minority of those, however, does not match. Such minority of nuclides are modified to consider those tissue weighting factor and bone-seeking. Furthermore, concrete value of absorbed dose is calculated. Kalium and cesium are adopted as in point examples. It is shown that this study is useful to understand the influence of radioactive substances to a human body for general scientists and engineers. Universality of knowledge in hydrology is proved in the other field.