Journal of Medical Physics
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Year : 2004  |  Volume : 29  |  Issue : 2  |  Page : 69-76

Dosimetry Of New 137Cs Sources Produced By Brit



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A Shanta


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Source of Support: None, Conflict of Interest: None


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The 137Cs lntracavitary Kit, supplied by Board of Radiation and lsotope Technology (BRIT), is in clinical use for over two decades. Recently, BRlT has modified the design of the 137Cs sources. This paper gives the dosimetry data for the new type of 137Cs sources. The dose rate constant, which is the dose rate, in tissue, at 1 crn on the transverse axis along the centre of the active source, worked out to be 0.934 Gy.h1.cm2.U-I for the CSA-1 type source of active length 1.5 cm and 1 .012 cGy.h-l.cm2.U-I for CSA-2 type source of active length 1.0 cm. The dose rate constant evaluated using Monte Carlo simulation (MCNP codeversion 3.1) agrees within 1 %. The dose rate constant measured using TLD and perspex phantom yielded a value of 0.927 cGy.k1.cm2. U1 for CSA-1 type source and 1.053 cGy.h-'.cm2.U-I for CSA-2 type source, which are well within the uncertainty of measurement. Dose contributions at points A and B, as defined in the Manchester system of dosimetry, have been worked out for standard loadings.


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