A portable apparatus for measuring exposure in roentgens from strong γ-ray sources

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DOIResolve DOI: http://doi.org/10.1016/0020-708X(63)90015-2
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TypeArticle
Journal titleThe International Journal of Applied Radiation and Isotopes
ISSN0020-708X
Volume14
Issue10
Pages511516; # of pages: 6
AbstractMeasurement of the radiation from cobalt-60 and cesium-137 sources is the main purpose of the apparatus described here. Precision (±0.1%) and long-term stability (±0.2%) combined with portability and ruggedness were aimed for in its design. A fully guarded cavity ionization chamber is used in a Townsend balance circuit, with an amplifier-electrometer to sense the null. The ionization current is collected on a teflon-dielectric capacitor and the balancing potential, derived from a source stabilized by zener diodes, is read directly from the dial of a ten-turn potentiometer. Possible errors arising from the response of the chamber to the scattered radiation from large cobalt-60 sources are considered in the light of recently published spectral information.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada
Peer reviewedYes
NRC number7443
NPARC number21275059
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Record identifierff7fc223-0590-4280-91ea-8a8310485bff
Record created2015-05-06
Record modified2016-05-09
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