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MATRIX DOSEMETER TO STUDY THE UNIFORMITY OF HIGH ENERGY X-RAY BEAMS

H. E. JOHNS PH.D., J. A. RAWLINSON M.SC., and W. B. TAYLOR C.ENG.

A 49 ion chamber matrix for measuring field flatness is described.

The device is used routinely for checking the operation of our 25 MV linac and 25 MV betatron. On numerous occasions it has enabled us to detect the malfunction of the machines before treatment has started.

The required circuits involve no new principles, but are rather complicated. The detailed circuits can be obtained from the Ontario Cancer Institute on request.


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