Geometrical Detection Efficiency of Point and Disc Source

• Published in: RADIOISOTOPES Vol. 22; no. 12; pp. 681 - 689
• Main Authors: FURUTA, Tomihiko, MATSUI, Yoshiko
• Format: Journal Article
• Language: Japanese
• Published: Japan Radioisotope Association 15.12.1973
• ISSN: 0033-8303; 1884-4111
• DOI: 10.3769/radioisotopes.22.12_681

The geometrical efficiencies of a point and a disc source on the radiation detection by a detector with circular window were calculated by a polynomial expression. Those were calculated in the case of a source off the center line of the detector window, too. It was found that the geometrical efficiency Gpof a point source at a point P (x, z) off the center line, in the case of z≥5A, can be approximately expressed as: Gp/Go=1.0-1.54 (x/z) 3+0.89 (x/z) 3 Go=1/2 (1.0-D/z) : geometrical efficiency of a point source on the center line. The geometrical efficiency Gsof a disc source (radius R) on the center line, in the case of z≥5A, can be approximately expressed as: Gs/Go=1.0-0.84 (R/z) 2+ (R/z) 3