Dosimetry for Fast-neutron Irradiations of Cultured Cells and Intact Animals

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Abstract
In addition to the use of tissue-equivalent ionization chambers for neutron dosimetry, sulphur activation detectors were employed for special dosimetry purposes. A comparison of the two dosimetry methods was carried out for neutrons produced by the D-D and the D-T reactions. For 15 mev neutron irradiations a good agreement between both methods was obtained. However, for 3 mev neutron irradiations, it was found that the dose calculated on the basis of the sulphur activation had to be multiplied by a factor 1·65 to obtain the correct value corresponding to the tissue-equivalent ionization chamber. The large resonances in the cross-section curve for the (n, p) reaction in sulphur for the neutron energy region between 2·5 and 4 mev may be responsible for the discrepancy in the doses measured with these independent methods.

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