Penumbral measurements in water for high‐energy x rays
- 1 January 1986
- journal article
- research article
- Published by Wiley in Medical Physics
- Vol. 13 (1) , 101-104
- https://doi.org/10.1118/1.595963
Abstract
Ionization chambers of varying inside diameter have been used to investigate the penumbral region of 60Co, 6-MV, and 31-MV x-ray beams. Measurements were made in water at varying depths up to 25 cm for a square field of side length 10 cm. The dependence of the penumbral widths on both the inside diameter of the ionization chamber and the depth in water is established along with the asymmetry of the penumbral distributions about the 50% level. A standard correction is indicated to eliminate the dependence of the measured penumbral widths on the inside diamter of the ionization chamber.Funding Information
- Medical Research Council Canada (MA-8163)
This publication has 1 reference indexed in Scilit:
- Characteristics of cobalt-60 penumbral regionsMedical Physics, 1985