The Measurement of Low Energy X-Rays III: Ferrous Sulphate G-Values

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, , Citation J Law and A T Redpath 1968 Phys. Med. Biol. 13 371 DOI 10.1088/0031-9155/13/3/304

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1 Edinburgh University, Department of Medical Physics, Royal Infirmary, Edinburgh, 3

Dates

  1. Received 2 November 1967

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0031-9155/13/3/371

Abstract

A total absorption calorimeter has been used to measure energy flux in low energy X-ray beams from a Be - window Machlett tube. These beams were then totally absorbed in ferrous sulphate (Fricke) dosemeter solution and measurement of total ferric ion production used to calculate G-values. The results using 0·8N-H2SO4 solutions were 13·1±0·2 for 20 kvp, 13·0±0·2 for 15 kvp and 12·9±0·3 for 10 kvp beams. In 0·1N-H2SO4 the result was 13·0±0·2 for a 20 kvp beam.

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