Beta and Gamma Correction Factors for the Eberline R0-20 Ionization Chamber Survey Instrument

Johnson, Michelle L ; Rathbone, Bruce A ; Bratvold, Tom

Pacific Northwest National Laboratory (U.S.)

关键词: 46 Instrumentation Related To Nuclear Science And Technology;    Beta Detection;    Gamma Detection;    Radiometric Surveys;    Thallium 204;   

DOI  :  10.2172/786805
RP-ID  :  PNNL-13603
RP-ID  :  AC06-76RLO1830
RP-ID  :  786805

美国|英语

来源: UNT Digital Library

【 摘 要 】

This technical document provides details of derived correction factors for the Eberline R0-20 survey meter, which uses an ionization chamber to measure ambient exposure rates. A thin end window allows the instrument to measure exposure rates from non-penetrating radiation (i.e., beta radiation). Correction factors are provided for contact measurements with beta and gamma disk sources, gamma beams and, finally, general area beta fields. Beta correction factors are based on the instrument's response to 204Tl, selected as the most conservative isotope for beta correction factors, as indicated in previous studies of similar instruments using 204Tl, 147Pm, and 90Sr(Y) isotopes (LANL 1982). Gamma correction factors are based on 137Cs, considered the predominant source of gamma radiation on the Hanford Site.