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Comparison of superheated drop detector with phosphorous pentoxide powder for the detection of neutrons in 18 MV x rays
Author(s) -
Loye T.,
Sidhu N. P. S.,
Sandison G. A.
Publication year - 1999
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.598594
Subject(s) - materials science , neutron , radiochemistry , superheating , drop (telecommunication) , pentoxide , nuclear physics , neutron temperature , x ray detector , detector , optics , chemistry , physics , metallurgy , condensed matter physics , telecommunications , computer science , vanadium
Neutron dose equivalent measurements were performed in and around an 18 MV x‐ray beam using superheated drop detectors (SDD) and phosphorous pentoxide ( P 2O 5 ) powder. The neutron dose equivalent profiles for various field sizes of 10 × 10 cm 2 ,20 × 20 cm 2 , and 30 × 30 cm 2were measured. The results measured with the P 2O 5were checked for any gross systematic errors by comparing with the published results computed by using Monte Carlo calculations. A comparison was then made between the neutron dose equivalent profiles measured with the P 2O 5and the SDD. The results of this comparison show that the neutron dose equivalents measured with the two types of detectors agree with each other for measurements about 20 cm away from the beam edges. However, in and near the beam edges the SDD measurements are upto 50% less than the neutron dose equivalents measured using P 2O 5for the 18 MV x‐ray beam.