134Cs for the treatment of cervical cancer

One projected use of 134Cs is for the treatment of cancer of the uterine cervix. The isodose curves for cancer of the cervix commonly have the shape shown in Fig. 1a and b. As can be seen, the tumour volume is not the same shape as the high dose treatment volume. With moderate energy radionuclides it should be possible to use filtration to try to fit the isodose shape to the tumour volume using a single central line source with a suitable variation of linear activity along its length.