The paper describes the determination of the gamma sensitivity and the exposure factor of a tissue-equivalent ionization chamber and an aluminium chamber. The experimental results agreed well with the nominal values within definite uncertainty.
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J. R. Williams and J. R. Greening , Phys. Med. Biol ., 25 , 2 , 215 ( 1980 ).
B. J. Mijnheer and J. R. Williams , Phys. Med. Biol ., 26 , 1 , 57 ( 1981 ).