PHOTON, NEUTRON AND CHARGED PARTICLE ABSORBED DOSE MEASUREMENTS WITH A PORTABLE MICROCALORIMETER.
NAVAL RADIOLOGICAL DEFENSE LAB SAN FRANCISCO CALIF
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Two compact, portable microcalorimeters were built and used to measure absorbed dose. A thermal shield near liquid nitrogen temperature provides the necessary isothermal environment for the absorber. Temperature increase of the absorber during irradiation is measured with a thermistor. Tissue equivalent plastic and beryllium absorbers were calibrated for absorbed energy as a function of temperature change by exposures to standard Co60 and Cs137 gamma-ray sources. The beryllium absorber detected gamma-ray doses as low as 0.17 rads 17 ergsg with a standard error of 6 percent. Microcalorimetric measurements of absorbed dose from continuous and pulsed X-rays, reactor neutrons, and charged particles were compared to measurements with other dosimeter systems. Author
- Nuclear Instrumentation