The dosimetric characteristics of linear accelerator radiosurgery for
10-MV X-ray were measured. Measurement of the relative output factor a
nd tissue maximum ratio with a microchamber produced results equivalen
t to those of measurement with X-ray film. The 80% isodose level width
measured with the microchamber was significantly smaller than that me
asured with the X-ray film. For the measurement of relative output fac
tor and tissue maximum ratio, a microchamber seems to be the more appr
opriate choice. X-Ray film was found to be suitable for beam profile m
easurement.