Phosphorous-Implanted Glass For Radiotherapy: Effect Of Implantation Energy

A chemically durable glass that contains a large amount of phosphorous is useful for in situ irradiation of cancers. It can be activated to be a B-emitter with a half-life of 14.3d by using neutron bombardment. Microspheres of the activated glass that are injected to tumors can irradiate the tumors directly with B-rays without irradiating neighbouring normal tissues. In this study, P+ ions in various doses have been implanted into a pure silica glass in a plate form at 200keV. Almost all the implanted phosphorus is present in the inner region of the glass, rather than in the surface region, taking the form of phosphorus colloids for all the doses in the range of 5x10 16-1x 10 18 cm-2.