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SCATTERED RADIATION FROM A 1700 CURIES Cs$sup 137$ THERAPY UNIT
Per Olof Grände, J. L. Haybittle
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Abstract
In studying the protection of a 1700-curie Cs /sup 137/ therapy unit, the radiation penetrating the source housing and also the radiation scattered from the beam were measured. The angular distribution of the radiation scattered from the air and from the patient (phantom) was measured for two different field sizes and two different phantom sizes. Investigation of the radiation quality was done by means of lead absorbers surrounding the ionization chamber which had been calibrated beforehand against a radium standard source. The results are compared with those predicted by theory. (auth)