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Source: Proxima Therapeutics, Inc.

"Gliasite is a procedure that delivers radiation to delicate parts of the brain. It follows the surgical removal of malignant brain tumors.
Once a tumor has been removed, a Gliasite balloon catheter is inserted into the remaining cavity. The catheter stays in the cavity for several days until the patient has recovered from surgery. It is then slowly filled with a solution of liquid radiation called Iotrex.
The Iotrex radiation is delivered over the course of about a week. The radiotherapy works through the balloon on the edges of the tumor cavity, where future tumors are most likely to develop." Source: http://www.umm.edu/neurosurgery/gliasite.html