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Measurement of the neutron sensitivity of TLD‐300 irradiated in a tissue equivalent phantom by d ( 48.5 ) + Be neutrons
Author(s) -
Angelone M.,
Yudelev M.,
Kota C.,
Maughan R. L.
Publication year - 1998
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 - 10.1118/1.598239
Subject(s) - thermoluminescent dosimeter , neutron , imaging phantom , dosimeter , ionization chamber , thermoluminescence , dosimetry , physics , gamma ray , nuclear medicine , radiochemistry , irradiation , nuclear physics , materials science , radiation , ionization , optics , chemistry , medicine , ion , quantum mechanics
The neutron sensitivities of the total response( k T ) as well as of separate peaks 3( k 3 ) and 5( k 5 ) on the glow curve were measured for CaF 2: Tm (TLD‐300) thermoluminescent dosimeters. The TLD‐300 were encapsulated in A‐150 TE plastic and located at different depths in the water phantom. The phantom was irradiated with neutrons produced by the d ( 48.5 ) + Be reaction at the superconducting cyclotron of the Gershenson Radiation Oncology Center at Harper Hospital. A set of measurements, based on the use of a TE ionization chamber and Geiger–Müller (GM) counter was used to measure the neutron( D n ) and gamma( D γ ) dose at these locations. The neutron sensitivities of the TLDs were thus derived by comparison with the results obtained with the twin detector method. The average neutron sensitivities relative to gamma of the total response and the responses of single peaks 3 or 5 are 0.215 ± 0.016 ,0.126 ± 0.010 , and 0.357 ± 0.014 , respectively. A linear relationship was found between the ratio of the areas under peak 3 to that under peak 5 and the ratio of the gamma dose to the total dose.