Comparative Measurement of Radioactivity with Standard Gamma-ray Ionization Chamber System
Park, Tae-Soon;Woo, Dong-Ho;Oh, Pil-Jae;Hwang, Sun-Tae;
ABSTRACT
A Standard gamma-ray ionization chamber system was developed with a well type ionization chamber and micro current measuring circuit. Micro current was measured by the automatic Townsend balance with stepwise compensation method. For gamma emitting nuclides such as $^{241}Am,;^{133}Ba,;^{60}Co,;^{134}Cs,;^{137}Cs,;and;^{22}Na$ relative calibration factors to $^{226}Ra$ reference source were calculated and detection .efficiency curve was determined as a fudnction of gamma energy.