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THERMAL AND FAST NEUTRON DOSE EQUIVALENT DISTRIBUTION MEASUREMENT OF 15-MV LINEAR ACCELERATOR USING A CR-39 NUCLEAR TRACK DETECTORS.
- Source :
-
Radiation protection dosimetry [Radiat Prot Dosimetry] 2020 Jul 02; Vol. 188 (4), pp. 503-507. - Publication Year :
- 2020
-
Abstract
- The main purpose of this study is to measure the contribution of the thermal and fast neutron dose along the central axis of the 15 MV Elekta Precise linac in a tissue equivalent phantom. In order to achieve this purpose, different points were selected in three field sizes of 5 × 5 cm2, 10 × 10 cm2 and 15 × 15 cm2. Fast and thermal neutrons were measured using CR-39 nuclear track detectors with and without thermal neutron converter of 10B, respectively. According to the results, the fast neutron dose equivalent was decreased as the depth increased (field size 5 × 5, 10 × 10 and 15 × 15 cm2 fall from 0.35 to 0.15, 0.5 to 0.3 and 0.5 to 0.3, respectively). Thermal dose equivalent was increased as the depth increased in the tissue equivalent phantom (field size 5 × 5, 10 × 10 and 15 × 15 cm2 rise from 0.1 to 0.4, 0.4 to 0.8 and 0.4 to 0.9, respectively). In conclusion, at depth <3 cm, most existing neutrons are fast and CR-39 films are sensitive to fast neutrons; therefore, they are more appropriate than thermoluminescent dosemeters in measuring neutron dose equivalent.<br /> (© The Author(s) 2020. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oup.com.)
- Subjects :
- Neutrons
Phantoms, Imaging
Polyethylene Glycols
Fast Neutrons
Particle Accelerators
Subjects
Details
- Language :
- English
- ISSN :
- 1742-3406
- Volume :
- 188
- Issue :
- 4
- Database :
- MEDLINE
- Journal :
- Radiation protection dosimetry
- Publication Type :
- Academic Journal
- Accession number :
- 32025737
- Full Text :
- https://doi.org/10.1093/rpd/ncaa001