Kulkarni R N
Strahlentherapie. 1980;156(10):694-6.
The contribution of electron contamination to the dose received by the skin and the underlying tissues during teletherapy with 60Co gamma-rays has been determined by an indirect method. First, the distribution of dose under the skin due to an uncontaminated beam of 60Co gamma-rays was determined using the Monte Carlo method without any major assumption. This distribution was then subtracted from the measured distribution of total dose available in the literature, to get the required dose distribution due to electron contamination. The distribution as determined in this work has been compared with that determined by some other workers, who relied on the dose distribution due to an uncontaminated beam calculated under some assumptions. It was found that the dose due to electron contamination was overestimated by them in the middle depths. This was as expected, because with their assumptions in the calculation of the dose distribution due to an uncontaminated beam, this dose is underestimated in the middle depths.
通过一种间接方法确定了在60Co伽马射线远距离治疗期间电子污染对皮肤和深层组织所接受剂量的贡献。首先，使用蒙特卡罗方法在没有任何主要假设的情况下确定了未受污染的60Co伽马射线束在皮肤下的剂量分布。然后从文献中测得的总剂量分布中减去该分布，以得到电子污染所致的所需剂量分布。将本研究确定的分布与其他一些研究人员确定的分布进行了比较，其他研究人员依赖于在某些假设下计算出的未受污染束的剂量分布。结果发现，他们在中间深度处高估了电子污染所致的剂量。这正如预期的那样，因为根据他们在计算未受污染束的剂量分布时所做的假设，该剂量在中间深度处被低估了。
