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Biomedical subjects

D L Haskard

Publications and source records attributed to D L Haskard.

7 recordsLinked to original sources

An "instantaneous" display linear accelerator field flatness monitor.

A beam flatness monitor is described which consists of 16 iron chambers and amplifiers, the outputs of which are sequentially sampled and displayed as a series of dots or lines on a conventional CRO, giving an instantaneous display of beam flatness variations. The device is used routinely for checking the beam flatness of our Linacs. The device involves no new principles, but represents a radical change in approach to the checking of Linac beam uniformity.

Electronics, Medical

Problems encountered with a radiation field analyzer.

Isodose measurements of 4-MV beams obtained with a Therados radiation field analyzer were found to vary significantly with the types of detector used, viz., a Physikalisch-Technische Werkstatten (PTW) ion chamber with positive and negative collecting potentials and a Therados diode detector. Suitable means of minimizing the ion chamber polarity effect are described.

Radiotherapy Dosage