A PORTABLE APPARATUS FOR MEASURING EXPOSURE IN ROENTGENS FROM STRONG $gamma$-RAY SOURCES
Journal Article
·
· Intern. J. Appl. Radiation Isotopes
An apparatus is described for measurement of the radiation from cobalt- 60 and cesium-137 sources. Precision ( plus or minus 0.1%) and long-term stability ( plus or minus 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 teflondielectric 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. (auth)
- Research Organization:
- National Research Council, Ottawa
- NSA Number:
- NSA-18-007070
- OSTI ID:
- 4119545
- Journal Information:
- Intern. J. Appl. Radiation Isotopes, Journal Name: Intern. J. Appl. Radiation Isotopes Vol. Vol: 14
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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