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Abstract

For the introduction of the new measurement quantity in radiation protection by external exposure which has been under discussion for some years, no primary standard exists at present. Conversion factors linking the new quantities with the primary standards for air kerma or absorbed dose in water, which are presented in the literature, are based on Monte Carlo calculations with the exception of a few experimental results. Measurements of the distribution of dose equivalent in the ICRU sphere were therefore performed, using a 0.8 cm**3 spherical ionisation chamber which was developed at the PTB. A PMMA hollow sphere, 30 cm in diameter and filled with water, served as a phantom. With this arrangement conversion factors between the 10 mm dose equivalent in the ICRU sphere and the air kerma were obtained in the energy range from 26 keV up to 1,2 MeV.

Additional information

Authors: SELBACH H L, PHYSIKALISCH-TECHNISCHE BUNDESANSTALT, BRAUNSCHWEIG (GERMANY);HOHLFELD K, PHYSIKALISCH-TECHNISCHE BUNDESANSTALT, BRAUNSCHWEIG (GERMANY);KRAMER H M, PHYSIKALISCH-TECHNISCHE BUNDESANSTALT, BRAUNSCHWEIG (GERMANY);SCHNEIDER U PHYSIKALISCH-TECHNISCHE BUNDESANSTALT, BRAUNSCHWEIG (GERMANY), PHYSIKALISCH-TECHNISCHE BUNDESANSTALT, BRAUNSCHWEIG (GERMANY)
Bibliographic Reference: IRPA CONGRESS 1984, BERLIN-WEST (GERMANY), MAY 7-12, 1984 WRITE TO CEC LUXEMBOURG, DG XIII/A2, POB 1907 MENTIONING PAPER E 31353 ORA
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