Abstract
With the increased application of high-energy radiation beams in therapy, the use of chemical dosimetry has become very extensive. The conventional measurement technique limits the minimum measurable dose to 4 krads, within a standard deviation of 1 %. In order to calibrate the electron and photon output of a 35-MeV therapeutic betatron, we have developed a dosimetric technique by which doses as small as 250 rads can be measured with a standard deviation of 1%. Specially designed 5- and 10-cm path length microcells were used to measure the absorbance of the irradiated solution at 224-nm absorption peak. Since the volume of the dosimetric solution used is less than 0.5 ml, this technique has the advantage of measuring doses more representative of that at a point. In the course of this investigation we have observed that the use of polystyrene irradiation containers increased the standard deviation of measurement to 3 %. However, when thin-walled Pyrex containers were used, the standard deviation was 1%.
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