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- Title
Re-evaluation of correction factors of a primary standard graphite calorimeter in 60Co gamma ray beams as a basis for the appointment of the BEV absorbed dose rate to water reference value.
- Authors
Baumgartner, Andreas; Steurer, Andreas; Tiefenböck, Wilhelm; Gabris, Frantisek; Maringer, Franz Josef; Kapsch, Ralf-Peter; Stucki, Gerhard
- Abstract
The graphite calorimeter of the Federal Office of Metrology and Surveying (BEV-Bundesamt für Eich- und Vermessungswesen) was established in the 1980s as the primary standard for the absorbed dose to water for 60Co gamma ray beams. To maintain the primary standard at an international level the graphite calorimeter and its corresponding components had to undergo a refurbishment and modernisation process. The correction factors of the graphite calorimeter were re-evaluated with Monte Carlo and experimental methods to obtain improved values. These are the correction for the effect of the gaps (1.0061), the scaling correction (0.9998), the correction for the difference in air attenuation (0.9971) and the corrections for the effective measurement depths in the graphite phantom for the graphite calorimeter (0.9886) and the CC01-105 ionisation chamber (0.9913). Consequently, it was necessary to change the reference value for the absorbed dose rate to water of the 60Co teletherapy unit used for the calibration of secondary standard dosemeters.
- Subjects
GRAPHITE; CALORIMETERS; IONIZING radiation dosage; GAMMA rays; MONTE Carlo method
- Publication
Radiation Protection Dosimetry, 2011, Vol 145, Issue 1, p3
- ISSN
0144-8420
- Publication type
Article
- DOI
10.1093/rpd/ncq376