A cross-validation study of Ge-doped silica optical fibres and TLD-100 systems for high energy photon dosimetry audit under non-reference conditions

Fadzil, Muhammad Safwan Ahmad; Noor, Noramaliza Mohd; Tamchek, N.; Ung, Ngie Min; Abdullah, Norhayati; Dolah, M. T.; Bradley, D.A.

doi:10.1016/j.radphyschem.2022.110232

Cited by 8 publications

(5 citation statements)

References 27 publications

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“…The use of a scintillator or semiconductor detector technologies to detect high-energy environmental gammas has a major disadvantage as their efficiency decreases with the increasing energy of the gamma radiation. By contrast, the use of integrating passive detectors, such as TLD, provides less energy-dependent exposure measurement results for gammas with higher energy [ 47 , 48 ]. Moreover, because of their size and weight, the integrating passive detectors, such as TLDs, could be deployed directly at the location where one would like to find the ambient dose from environmental gamma flux.…”

Section: Discussionmentioning

confidence: 99%

Ambient Dose and Dose Rate Measurement in SNOLAB Underground Laboratory at Sudbury, Ontario, Canada

Golovko

Kamaev

Sun

et al. 2023

Sensors

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The paper describes a system and experimental procedure that use integrating passive detectors, such as thermoluminescent dosimeters (TLDs), for the measurement of ultra-low-level ambient dose equivalent rate values at the underground SNOLAB facility located in Sudbury, Ontario, Canada. Because these detectors are passive and can be exposed for relatively long periods of time, they can provide better sensitivity for measuring ultra-low activity levels. The final characterization of ultra-low-level ambient dose around water shielding for ongoing direct dark matter search experiments in Cube Hall at SNOLAB underground laboratory is given. The conclusion is that TLDs provide reliable results in the measurement of the ultra-low-level environmental radiation background.

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Section: Discussionmentioning

confidence: 99%

Ambient Dose and Dose Rate Measurement in SNOLAB Underground Laboratory at Sudbury, Ontario, Canada

Golovko

Kamaev

Sun

et al. 2023

Sensors

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“…With 6 MV X-rays at a dose rate of 600 cGy/min, SSD = 100 cm, an irradiation field of 10 cm × 10 cm, PDD = 100% at 1.5 cm above the beam center axis, the screened and annealed TLD was divided into seven groups with four TLDs in each group and placed at a 1.5 cm depth of equivalent solid water. After emitting beams of 5, 30, 50, 70, 100, 150, 200, and 300 MU, the real value of each TLD was recorded and the mean value M of each group of the measured data was calculated by subtracting the background count to obtain the scale factor of this batch of TLDs [20]. The TLD scale factor N is the quotient obtained by dividing the number of beam monitor units H of the linear accelerator by the mean reading value M of the TLDs, namely N = H∕M…”

Section: Tld Calibrationmentioning

confidence: 99%

TLD calibration and absorbed dose measurement in a radiation-induced liver injury model under a linear accelerator

Xiao

Liu

et al. 2023

NUCL SCI TECH

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The application of a thermoluminescent detector (TLD) for dose detection at the liver irradiation site in mice under linear accelerator precision radiotherapy and the use of a single high dose to irradiate the mouse liver to construct a biological model of a radiation-induced liver injury (RILD) in mice were to determine the feasibility of constructing a precision radiotherapy model in small animals under a linear accelerator. A 360° arc volumetric rotational intensity-modulated radiotherapy (VMAT) plan with a prescribed dose of 2 Gy was developed for the planned target volume (PTV) at the location of the TLD within solid water to compare the difference between the measured dose of TLD and the assessed parameters in the TPS system. The TLD was implanted in the livers of mice, and VMAT was planned based on TLD to compare the measured and prescribed doses. C57BL/6 J mice were randomly divided into control and 25-Gy radiation groups and were examined daily for changes in body weight. They were euthanized at 3 and 10 weeks after radiation, and the levels of liver serum enzymes such as alanine aminotransferase (ALT), aspartate aminotransferase (AST), and alkaline phosphatase (ALP) were measured to observe any pathological histological changes in the irradiated areas of the mouse liver. The measured values of solid underwater TLD were within ± 3% of the Dmean value of the evaluation parameter in the TPS system. The mice in the 25-Gy radiation group demonstrated pathological signs of radiation-induced liver injury at the site of liver irradiation. The deviation in the measured and prescribed doses of TLD in the mouse liver ranged from − 1.5 to 6%; construction of an accurate model of RILD using the VMAT technique under a linear accelerator is feasible.

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“…The time-temperature profile (TTP) and the glow curve analysis of fabricated fibres in respect to megavoltage electron beam reported by Kandan (2021) was applied to the readout of the CF and FF signals. (Fadzil et al, 2022).…”

Section: Characterisation Of the Fibre Dosimetersmentioning

confidence: 99%

“…1. The polyethylene capsule (a) components and (b) overall dimension measurement(Fadzil et al, 2022).…”

mentioning

confidence: 99%

Dosimetric characteristics of fabricated germanium doped optical fibres for a postal audit of therapy electron beams

Abdullah

Bradley²,

Nisbet³

et al. 2022

Radiation Physics and Chemistry

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A cross-validation study of Ge-doped silica optical fibres and TLD-100 systems for high energy photon dosimetry audit under non-reference conditions

Cited by 8 publications

References 27 publications

Ambient Dose and Dose Rate Measurement in SNOLAB Underground Laboratory at Sudbury, Ontario, Canada

Ambient Dose and Dose Rate Measurement in SNOLAB Underground Laboratory at Sudbury, Ontario, Canada

TLD calibration and absorbed dose measurement in a radiation-induced liver injury model under a linear accelerator

Dosimetric characteristics of fabricated germanium doped optical fibres for a postal audit of therapy electron beams

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