The Calibration of Health Physics Instruments Used to Measure High Energy Radiation

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Abstract
Commonly used Health Physics ionization chambers and personnel monitors have been calibrated using high energy radiation from the CERN 600-MeV Synchro-cyclotron and 28-GeV Proton-synchrotron. The calibration has been done by using the tissue equivalent ionization chamber as reference and exposing the instruments in a 600-MeV proton beam and 400-MeV neutron beam as well as in the radiation field outside the shield close to the target region of the CERN Proton-synchrotron. Particle fluxes have been measured with the C-11 induced radioactivity in plastic phosphors. The results are compared with calibration data from the use of Pu-Be neutrons and Ra γ-rays for CO2, air, A and H2 filled ionization chambers as well as for neutron and gamma film badges and quartz fibre dosimeters.

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