Resumen:
The kerma factors and kerma relative to air and water of 24 compounds used as
tissue substitutes were calculated for neutron energy from 2.53x10-8 up to 29 MeV.
The kerma ratio of the tissue substitutes relative to air and water were calculated by
the ratio of kerma factors of the tissue substitute to air and water respectively. The
water equivalence of the selected tissue substitutes was observed above neutron
energies 100 eV. Kerma ratio relative to the air for Poly-vinylidene fluoride and
Teflon are found to be nearest to unity in very low energy (up to 1 eV) and above 63
eV respectively. It was found that the natural rubber as a water equivalent tissue
substitute compound. The results of the kerma factors in our investigation shows a
very good agreement with those published in ICRU-44. We found that at higher
neutron energies, the kerma factors and kerma ratios of the selected tissue substitute
compounds are approximately same, but differences are large for energies below 100
eV.