The Effect of Source Size upon Integral Dose in Teletherapy Units

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Abstract
A simple formula is deduced on theoretical grounds for calculating the effect of source size upon integral dose in teletherapy units. Measurements of integral dose using the ferrous sulfate system of chemical dosimetry were made and confirm the theoretical predictions. Particular attention is drawn to the critical influence upon integral dose of the distance from the skin to the defining aperture. If this distance is not too large, calculations show that the source-size in large teletherapy units need not increase integral doses above the levels that have been tolerated in the past.

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