Activity Measurement by Using γ-Ray Sum Peak Method Intake Radioactivity and Its Application

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Other Title
  • 体内放射能を想定したγ線サムピーク法による崩壊率測定とその応用
  • タイナイ ホウシャノウ オ ソウテイ シタ ガンマセン サムピークホウ ニ ヨル ホウカイリツ ソクテイ ト ソノ オウヨウ
  • Activity Measurement by Using γ-Ray Sum Peak Method Intake Radioactivity and Its Application

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Abstract

It is important to measure external and internal exposure dose in the case of accident. The external exposure can be measured by various dosimeters, but the internal exposure is usually calculated from estimated amounts of intake radioactivity because of difficulty of direct measurement. Detection efficiency of human counter used in direct measurement is necessary, but there is no effective method to determine it for non-uniform distribution. The γ-ray sum peak method is tried for the cascade γ-ray emitter under the consideration of small diffusion such as just after intake. After disintegration rates of sources of 46Sc and 60Co were determined by 4πβ-γ coincidence method, γ-ray spectra were measured at various positions. Calculated disintegration rates by sum peak method agreed with those by coincidence method within 10%. The similar results were obtained for distributed plural sources in restricted condition. It is also investigated as application for the case that the other nuclide is contained in it. Using peak-to-total ratios measured in advance, the disintegration rates were determined only from the peak intensities. In this case the results had systematic uncertainty of about 20%.

Journal

  • RADIOISOTOPES

    RADIOISOTOPES 49 (5), 253-259, 2000

    Japan Radioisotope Association

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