Standardization of neutron dosimetry procedures for external beam therapy
conference paper
Standardization of neutron dosimetry procedures for external beam therapy has been established in Europe and the United States of America and has resulted in two separate protocols. The use of calibrated A-150 plastic tissue equivalent (TE) ionization chambers with TE gas filling is recommended in both protocols as the practical method for obtaining the absorbed dose in a TE phantom. Experiments with TE ionization chambers applying the measurement procedures recommended in the two protocols have been performed with clinically employed d(15)+Be and d+T neutron beams. At a depth of 10 cm in the phantom, the results obtained by the two procedures show differences of about 6.5%. The different values for basic physical parameters given in both protocols can explain approximately 3.5% of the differences, whereas the use of different phantom materials can account for an additional 0.5%. The remaining 2.5% can probably be attributed to systematic differences in the operational characteristics of the two different types of TE ionization chambers used by the American centres and the European groups.
TNO Identifier
353509
ISBN
92-0-010281-6
Publisher
International Atomic Energy Agency
Article nr.
IAEA-SM-249/37
Source title
Biomedical dosimetry : Physical aspects, instrumentation, calibration, Proceeedings of a Symposium, Paris, F, 27-31 October 1980
Place of publication
Vienna
Pages
329-339
Files
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