THE MEASUREMENT OF GONAD DOSE IN RADIOTHERAPY, WITH REFERENCES TO THE PATIENTS OF BENIGN TUMORS AND THE ATTENDANTS OF INFANTILE PATIENTS
1964 Volume 19 Issue 4 Pages 246-250
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1964 Volume 19 Issue 4 Pages 246-250
In recent years medical use of ionizing radiation has increased, bringing obout a proportional increase in the amount of gonadal exposure of the individuals and populations. When a great many peaples are exposed even with minimal dose of radiation which dose not produce any somatic effects, genetic injuries may increas in future. As to genetic injuries, the gonad dose of patients with child expectancy is of the most importance. On this basis the genetically significant dose (GSD) received from X-rays examination has been measured in Japan as well as several countries. Little contributions to the GSD is expected by external radiotherapy in malignant conditions where the child expectancy of the patients is usually very small. In the radiotherapy of non-malignant conditions, individual gonad dose is expected to be higher than that of in X-rays examination and the child expectancy of the patients recieving the treatment is often as well as that of X-rays examination. Another possible gonadal exposure may be considered for radio-therpy of infantile patients as the parents or relatives of the patients sometimes attend and take care of them not to move during the treatment. This report shows the amount of gonadal exposure in X-rays tratments with reference to 50 cases of patients of non-malignant condition, for instance, hemoangiomas, scrofulas and so on, and 17 cases of attendants of infantile patients. The gonad dose are less than 300mr in the most cases but more than 5O0mr in a few cases in one session of X-rays treatment. Furthermore, the fundamental experiments connected with the measurement of gonad dose are performed by using phantoms. A little reductions of gonadal exposure of the attendants are obtained by three methods as follows ; (1) to use a lead rubber apron, (2) to place a lead board 1 to 2 mm thick under the patient, and (3) to make the attendant stand by the patient on the saggital diredtion.
