A new parallel-plate graphite ionization chamber as a Co-60 gamma radiation reference instrument

作者：Perini Ana P; Neves Lucio P; Fernandez Varea Jose M; Cassola Vagner F; Kramer Richard; Khoury Helen J; Caldas Linda V E^*

来源：Radiation Physics and Chemistry, 2014, 95: 106-108.

DOI：10.1016/j.radphyschem.2013.01.005

• Graphite ionization chamber
• Reference system
• Gamma radiation
• Monte Carlo simulation

The calibration procedure in radiotherapy treatments is very important and a sensitive task due to the high doses delivered to the patients. Generally, the air-kerma cavity standards for Co-60 gamma rays are graphite cavity ionization chambers. In this work a new parallel-plate graphite ionization chamber was studied to analyze its potential use as a reference instrument. In order to evaluate its performance in Co-60 beams, it was submitted to several characterization tests. Moreover, Monte Carlo simulations were undertaken using the EGSnrc code to study the influence of the chamber components on its response. The results obtained showed that this new ionization chamber presented a satisfactory performance in all evaluated tests.

• 出版日期2014-2