| 摘要 |
PURPOSE:To discriminate precisely the contamination in the human body and the contamination on the surface of the body and to measure a contamination point in the body, total radiation dose, etc., by finding the ratio between the photoelectric effect component and Compton scattered component of a gamma-ray energy spectrum for the radiation measurement of the body. CONSTITUTION:The radiation of a person 1 to be measured is detected through a driving device 5, position detector 6, and radiation detector 3 by making a scan in the height direction and the measurement signal is supplied to a wave height analyzer 13 to find the ratio between the photoelectric component and Compton scattered component of the gamma-ray energy spectrum to discriminate between the contamination in the body and contamination on the surface of the body because the ratio of the Compton scattered component increases in case of the body surface contamination. When only the body surface contamination occurs, a measurement is taken again after contamination removal and the measurement is repeated until contamination is removed completely. When the comtamination in the body occurs, measurements of the position, total radiation dose, radiation unclear species, etc., are taken. Those measurement, arithmetic, etc., are automated by using a CPU to perform the measurement precisely in a short time.
|
