Determination of the absorbed dose rate to water for the 18-mm helmet of a gamma knife.


PURPOSE To measure the absorbed dose rate to water of (60)Co gamma rays of a Gamma Knife Model C using water-filled phantoms (WFP). METHODS AND MATERIALS Spherical WFP with an equivalent water depth of 5, 7, 8, and 9 cm were constructed. The dose rates at the center of an 18-mm helmet were measured in an 8-cm WFP (WFP-3) and two plastic phantoms. Two… (More)
DOI: 10.1016/j.ijrobp.2010.05.039