The paper describes the technique used in measuring absorbed dose components of neutron and photon in the (n
γ) mixed neutron field. The gamma-ray calibration was carried out by a collimated beam of
60
Co gamma-ray. The K
T
value of a TE-TE ionization chamber was calculated. The K
U
values of C-CO
2
Al-Ar chamber and GM counter were measured by a modified lead attenuation method. The correction factors were determined in the neutron field produced by T (d
n)
4
He reaction. Finally
the neutron Kerma and photon Kerma in tissue free-in-air was measured and their overall uncertainties were estimated.
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references
ICRU Report 26 , 1977 .
J. J. Broerse , Ion chambers for neutron dosimetry , Harwood Academic Publishers , 1980 , p. 151 .
D. J. Thomas and V. E. Lewis , Nucl. Instr. Meth. , 179 , 394 ( 1981 ).
J. R. Williams and J. R. Greening , Phys. Med. Biol. , 25 , 2 , 215 ( 1980 ).
ICRU Report 27 , 1978 .
J. H. Hough , Phys Med. Biol. , 24 , 4 , 734 ( 1979 ).
J. J. Broerse et al . , British Fournal of Radiology , 54 , 882 ( 1931 ).
B. J. Mijnheer et al . , Phys, Med. Biol. , 27 , 1 , 91 ( 1982 ).