Abstract
The calculation of iodine x-ray escape peak intensity to that of photopeak for different sizes of NaI(Tl) scintillation crystals has been carried out. Different source-crystal distances were considered for the case of a point source receiving a conical shell of radiation. Axel's formula of escape probability was used after correcting the fluorescence yield. The theoretical results obtained by a computer program were tested experimentally using a 75 keV energy line in 207Bi spectrum. An average 28% increase in the experimental values was observed and interpreted. Excellent agreement was found with Monte Carlo calculations for the case of small angles. The results showed that the expression of good geometry should be restricted only to small angles, otherwise the geometry effect should be considered. The geometry effect on the iodine x-ray escape ratio, which has not been calculated before, can be found from the results of many geometrical arrangements.
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