Abstract
The nature of the intensifying action of lead screens and Patterson screens has been investigated for gamma radiography. For the lead screens used it was found that nearly 52% of the blackening of the film is due to electrons ejected from the front screen and nearly 48% due to electrons ejected from the back screen. The blackening of the film due to the absorption by the film itself of the radiation is small. Similar results were obtained with Patterson screens except that about 10% of the effect of the screens is due to low energy radiation (light) which was stopped by 3 mgm. per cm.2 of aluminum.
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