Abstract
The principle and application of equivalent dose relationship in photographic dosimetry are discussed in detall. In spite of the nonlinear relationship between the density of the film and the exposure, differential measurements of mixed radiations are easily determined. When equivalent dose is plotted against exposure for various radiations, the deviation from linearity is less than plus or minus 10% up to the maximum reliable reading range of a conventional densitometer. This extends the range of dose to be measured approximately 1.5--2.0 times greater than when compared to the case of limited usage of linear density vs exposure region. Based on this relationship, a routine procedure of analysis for the estimation of the dose is given for mixed radiations including gamma, beta and thermal neutrons. Standard calibrations were made using a Sr/sup 90/--Y/sup 90/ source rather than radium or Co/sup 60/. The variation of the density was less than plus or minus 3% over the whole range of interest. (auth)
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