The dosimetry of the radiation from Californium-252

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Abstract
In using the two chamber method to separate components of neutron dose and gamma -ray dose in the mixed beam from californium-252, difficulties arise in determining the chamber sensitivities to neutrons from their calibration with a standard cobalt-60 gamma -ray field. This is because in the neutron field neither chamber can be regarded as a Bragg-Gray cavity. Conversion factors are calculated for two chambers of the same geometry, one made with tissue-equivalent walls and gas filling and the other made with carbon walls and used either with air or with carbon dioxide gas filling. The expected accuracies of dose measurement have been found to be +or-6% for total dose, +or-9% for the neutron component and +or-7% for the gamma -ray component.

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