Abstract

A description is given of generator and tube for use up to 400 KV. The protection of the observers is discussed. Experiments have been made on the variation of output with voltage and the copper filters possible at different potentials. The absorption of the rays in copper and variation of half-value layer is given. Measurements have been made in a water phantom on “back scatter,” distribution of radiation throughout the water mass, and the effects of variation of field size. It is shown that “back scatter” reaches a maximum for a given quality of radiation and that the variation of percentage depth dose with change of average wave-length is small. Some theoretical considerations are briefly mentioned.

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