[Measurement of the radiation load to bladder and rectum in gynecological brachytherapy with a mobile radiation source (author's transl)].

Measurement of the maximal radiation dose in bladder and rectum in intravaginal radiation therapy using a mobile source (afterloading technique) is only possible integrating with a multichannel dosimeter. For this purpose we apply a 5 mm plastic probe being equipped with five semiconductor dosimeter crystals; the latter are fixed within the probe at equidistances of 2 cm from each other. The dose maximum can be obtained by graphic interpolation using the five different values measured. The dosimeter employed is read immediately and permits observation of the doses delivered to the bladder and rectum during radiation therapy.