Highlights
- •Photon energy and dose rate dependence of GENA GD was assessed.
- •Sensitivity of GENA GD is independent of photon energy with variations less than 2.3%.
- •Sensitivity of GENA GD is independent of dose rate with variations less than 2.2%.
- •Dose resolution is independent of energy and dose rate with variations less than 1.5%.
Abstract
Purpose
In the current study, the energy and dose rate dependence of a new genipin-based gel
dosimeter, named GENA gel dosimeter, were investigated.
Methods
Prepared gel dosimeters exposed using a Varian clinical linac. Beam qualities of 6
and 18 MV were applied to investigate the GENA gel dosimeter’s energy dependence.
Furthermore, the gel dosimeters were exposed to 50, 100, 200, and 350 cGy/min dose
rates, ranging from 0 to 8 Gy. The irradiated gel dosimeters were read out using a
double beam UV–Visible spectrophotometer. The absorbance peak (AP) and area under
spectrum (AUS) were evaluated.
Results
Absorbance-dose sensitivities of (8.0 ± 0.18) × 10–3 cm–1Gy−1 and (7.8 ± 0.15) × 10–3 cm−1Gy−1 were obtained for GENA gel dosimeter for 6 and 18 MV beam qualities, respectively.
Results specified no significant difference (p > 0.05) between the GENA gel dosimeter’s
sensitivities irradiated using the two energies mentioned above. For the mentioned
dose rates, AP-dose sensitivities of (8.2 ± 0.22) × 10−3, (8.1 ± 0.21) × 10−3, (8.1 ± 0.2) × 10−3 and (8.0 ± 0.18) × 10−3 cm−1Gy−1 were obtained, respectively. Results showed no significant difference (p > 0.05)
between the GENA gel dosimeter’s sensitivities for the investigated dose rates and
energies. In addition, results revealed that when the incident photon energy and dose
rate changed, there were no significant differences (p > 0.05) between the GENA gel
dosimeter’s dose resolution values.
Conclusions
It is concluded that the response of the GENA gel dosimeter is not dependent on the
energy and dose rate (p > 0.05) within the studied energy and dose rate ranges.
Keywords
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Article info
Publication history
Published online: January 03, 2023
Accepted:
December 27,
2022
Received in revised form:
December 22,
2022
Received:
January 18,
2022
Identification
Copyright
© 2022 Associazione Italiana di Fisica Medica e Sanitaria. Published by Elsevier Ltd. All rights reserved.
