Abstract
The amount of activation by thermal and epithermal neutrons of silver in a photographic emulsion was calculated in terms of thermal neutron flux and cadmium ratio as determined by gold foils 1.27 cm in diameter by 0.0297 cm thick. The dose rate distributions around point sources of Ag108 and Ag110 were also calculated and used to determine the dose to a photographic emulsion resulting from activation of its own silver by thermal and epithermal neutrons. Experimental support for the calculations was obtained using Dupont Type 555 film. It was found that the dose to an emulsion due to thermal neutrons only could be expressed as D(th) = 0.52 × 10−10 (nvt) tdg rads, where (nvt) is the average thermal neutron flux in neutrons/cm2 and tdg is the silver content of the emulsion in mg/cm2. The ratio of the total dose to an emulsion due to both thermal and epithermal neutrons to the dose due to thermal neutrons only was obtained as a function of cadmium ratio.
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