Energy dependence of a radiophotoluminescent glass dosimeter for <scp>HDR</scp><sup>192</sup>Ir brachytherapy source

Hashimoto, S; Nakajima, Yoshiyuki; Abe, Kentaro; Kiura, Katsuyuki

doi:10.1002/mp.13319

Cited by 4 publications

(4 citation statements)

References 30 publications

(102 reference statements)

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“…12 Silicon diode detectors, which have a pronounced absorbed-dose energy dependence compared to air and water, have an intrinsic energy dependence similar to that of passive readout detectors studied elsewhere, that is, deviating from unity by up to 5%. [16][17][18][19][20][21] These findings show that it is important to determine both the absorbed-dose and the intrinsic energy responses for certain types of detectors and beam qualities. Although the results and analysis of this study are very dependent on the MC model used to model absorbed-dose energy response of detectors, detector blueprints were as accurate as possible according to the manufacturer.…”

Section: Discussionmentioning

confidence: 99%

“…The significant relative intrinsic energy dependence implies that the generic beam quality correction factors calculated using MC are not enough for use in low‐energy photon beams when detectors are calibrated in high‐energy photon beams as it is commonly done and recommended in the BT TG‐43 dosimetry protocol . Silicon diode detectors, which have a pronounced absorbed‐dose energy dependence compared to air and water, have an intrinsic energy dependence similar to that of passive readout detectors studied elsewhere, that is, deviating from unity by up to 5% …”

Section: Discussionmentioning

confidence: 99%

“…However, it cannot be ignored for other detector types when they are calibrated in high‐energy beams but used in low‐energy beams, for example, in BT. It has been shown that, for instance, some types of TLDs, radio‐photoluminescent glass dosimeters and EPR dosimeters calibrated in high‐energy photon beams exhibit a non‐negligible variation in their intrinsic energy response when used in kV beams. This was attributed mainly to the difference in the ionization density of secondary electrons between the calibration beam and the measurement beams (where the effective photon energy ranges from 13 to 375 keV) that affected either radical production in EPR dosimeters or traps formation in TLDs in addition to the dependence on TLD readout process…”

Section: Methodsmentioning

confidence: 99%

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Investigation of a synthetic diamond detector response in kilovoltage photon beams

et al. 2020

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Purpose An important characteristic of radiation dosimetry detectors is their energy response which consists of absorbed‐dose and intrinsic energy responses. The former can be characterized using Monte Carlo (MC) simulations, whereas the latter (i.e., detector signal per absorbed dose to detector) is extracted from experimental data. Such a characterization is especially relevant when detectors are used in nonrelative measurements at a beam quality that differs from the calibration beam quality. Having in mind the possible application of synthetic diamond detectors (microDiamond PTW 60019, Freiburg, Germany) for nonrelative dosimetry of low‐energy brachytherapy (BT) beams, we determined their intrinsic and absorbed‐dose energy responses in 25–250 kV beams relative to a 60Co beam, which is usually the reference beam quality for detector calibration in radiotherapy. Material and Methods Three microDiamond detectors and, for comparison, two silicon diodes (PTW 60017) were calibrated in terms of air‐kerma free in air in six x‐ray beam qualities (from 25 to 250 kV) and in terms of absorbed dose to water in a 60Co beam at the national metrology laboratory in Sweden. The PENELOPE/penEasy MC radiation transport code was used to calculate the absorbed‐dose energy response of the detectors (modeled based on blueprints) relative to air and water depending on calibration conditions. The MC results were used to extract the relative intrinsic energy response of the detectors from the overall energy response. Measurements using an independent setup with a single ophthalmic BEBIG I25.S16 125I BT seed (effective photon energy of 28 keV) were used as a qualitative check of the extracted intrinsic energy response correction factors. Additionally, the impact of the thickness of the active volume as well as the presence of extra‐cameral components on the absorbed‐dose energy response of a microDiamond detector was studied using MC simulations. Results The relative intrinsic energy response of the microDiamond detectors was higher by a factor of 2 in 25 and 50 kV beams compared to the 60Co beam. The variation in the relative intrinsic energy response of silicon diodes was within 10% over the investigated photon energy range. The use of relative intrinsic energy response correction factors improved the agreement among the absorbed dose to water values determined using microDiamond detectors and silicon diodes, as well as with the TG‐43 formalism‐based calculations for the 125I seed. MC study of microDiamond detector design features provided a possible explanation for inter‐detector response variation at low‐energy photon beams by differences in the effective thickness of the active volume. Conclusions MicroDiamond detectors had a non‐negligible variation in the relative intrinsic energy response (factor of 2) which was comparable to that in the absorbed‐dose energy response relative to water at low‐energy photon beams. Silicon diodes, in contrast, had an absorbed‐dose energy dependence on photon energy that varied by a factor of 6, whe...

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Investigation of a synthetic diamond detector response in kilovoltage photon beams

et al. 2020

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“…The general composition ratios of the glass for radiation dose measurement are P (31.55%), O (51.16%), Al (6.12%), Na (11.00%), and Ag (0.17%). The density and effective atomic number of the RPLD are 2.61 g/cm 3 and 12.039, respectively (6,7). When the RPLGD is exposed to ionizing radiation, stable color centers are created (6).…”

Section: Glass Dosimetermentioning

confidence: 99%

In vivo dosimetry of 3D gynecological brachytherapy using the glass dosimeter: a phantom study

Konlak

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Brachytherapy can deliver high doses to the target while sparing healthy tissues due to its steep dose gradient property. However, treatment was only performed according to the dose calculated by a treatment planning system without verification of the dose due to the characteristics. Therefore, the aim of this study was to design the in-house phantom to evaluate the dosimetric differences of gynecological brachytherapy under clinical conditions between calculation by the treatment planning system and measurement by the RPLGDs. An in-house phantom consisting of the glass dosimeter holder and the holder of the applicator was created. This holder was designed to move the axis of the holder to apply the rectum point that differs according to the patient's anatomy. In addition, the holder of the applicator was designed for application in various types of applicators in intracavitary brachytherapy. The clinical study was used to quantify variations between the calculated and measured dose for 6 cases at various points in the phantom, which included point A, point B, bladder point, and rectum points. The mean dose difference between the calculated and measured dose at point A was 1.99%, the bladder point was 4.42%, and the rectum point was 3.53%. All values were within 5% of the acceptable reference value agreement. For the low dose at point B, the measured dose differs from the calculated dose of about 0.1 Gy. We consider that in-vivo dosimetry in the in-house phantom using the RPLGD for brachytherapy can minimize overdoses and, estimate the real delivered dose for the patient's record using an accessory for the applicator in clinical practice.

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Measurement uncertainty analysis of radiophotoluminescent glass dosimeter reader system based on GD-352M for estimation of protection quantity

Kim

Park

Yoo

et al. 2022

Nuclear Engineering and Technology

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Energy dependence of a radiophotoluminescent glass dosimeter for HDR¹⁹²Ir brachytherapy source

Cited by 4 publications

References 30 publications

Investigation of a synthetic diamond detector response in kilovoltage photon beams

Investigation of a synthetic diamond detector response in kilovoltage photon beams

In vivo dosimetry of 3D gynecological brachytherapy using the glass dosimeter: a phantom study

Measurement uncertainty analysis of radiophotoluminescent glass dosimeter reader system based on GD-352M for estimation of protection quantity

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Energy dependence of a radiophotoluminescent glass dosimeter for HDR192Ir brachytherapy source

Cited by 4 publications

References 30 publications

Investigation of a synthetic diamond detector response in kilovoltage photon beams

Investigation of a synthetic diamond detector response in kilovoltage photon beams

In vivo dosimetry of 3D gynecological brachytherapy using the glass dosimeter: a phantom study

Measurement uncertainty analysis of radiophotoluminescent glass dosimeter reader system based on GD-352M for estimation of protection quantity

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Energy dependence of a radiophotoluminescent glass dosimeter for HDR¹⁹²Ir brachytherapy source