The Routine Use of Thermoluminescence Dosimetry for Radiation Therapy

Gooden, David S.; Brickner, Theodore J.

doi:10.1148/102.3.685

Cited by 13 publications

(9 citation statements)

References 5 publications

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“…So ADR is preferred in clinic rather than manual X-ray. Secondly, the reason why we did not use TLD to collect all scattered radiation in the first exposure is because TLD is unstable when the dosimeter is lower than 1 cGy [ 20 ], and is easily influenced by background radiation. In this research, fluoroscopy continuously works for 10 s and the lowest scattered radiation value in front of lead suit is 4.7

Gy, while the average daily background radiation in Taiwan is 3.5

Gy tested by TLD.…”

Section: Discussionmentioning

confidence: 99%

Occupational radiation exposure of orthopedists at different locations during pedicle screw insertion: An anthropomorphic phantom study

Chiang

Yin

et al. 2021

THC

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BACKGROUND: The purpose of this work was to evaluate orthopedic surgeons’ exposure to occupational radiation doses from scattering using a mobile flat panel C-arm X-ray machine at different standing positions during an intraoperative pedicle screw implantation. OBJECTIVE: Evaluate the radiation dose received by medical staff, by applying flat X-ray machine in surgical room during an intraoperative pedicle screw implantation. METHODS: A mobile flat-panel C-arm X-ray machine at a dedicated orthopedic operating room was used to image an anthropomorphic female phantom which was set in a prone position on the operating table. The X-ray was projected horizontally, and 1 minute continuous fluoroscopy was used for lumbar spine and thoracolumbar spine during pedicle screw implantation. Scattering radiation doses to orthopedic surgeons were measured at different standing positions and body heights (50, 100, 150 cm above the ground) with and without limited collimations. RESULTS: The dose area product (DAP) in this experiment is normalized as 343 μGy⋅m2. In the four areas, the lowest scattered radiation measured by DF is 11.2 vs. 0.7 μSv, outside and inside the lead suit, respectively, with or without restricted field, 150 cm above the ground, and the lowest scattered radiation dose inside the lead suit. It is 1.3 vs. 0.5 μSv. Comparing the highest dose of the TF at with the lowest dose of the DF, the average result is 73.7 vs. 11.1 μSv, P< 0.05. CONCLUSIONS: Using a mobile flat-panel C-arm X-ray machine during a pedicle screw implantation, the minimum scattering radiation to surgeons was found to be at the terminal DF area based on the analysis of the scattering doses orthopedic surgeons were exposed to.

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Gy, while the average daily background radiation in Taiwan is 3.5

Gy tested by TLD.…”

Section: Discussionmentioning

confidence: 99%

Occupational radiation exposure of orthopedists at different locations during pedicle screw insertion: An anthropomorphic phantom study

Chiang

Yin

et al. 2021

THC

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“…Usually heating the dosimeter to 400°C for five minutes will "dedose" a CaF 2 :Mn dosimeter which has been exposed to less than 500 mR. (Carlsson et al, 1968). Therefore, for.a precise experiment, the careful calibration of each individual TLD is necessary (Burch, 1968;Gooden and Brickner, 1972;Jacobson et al, 1973;Law, 1973 The experimental data were slightly lower than the ~xpected fading rate (solid line) for periods of less than one hour.. This is probably due to loss of signal (rapid fading) which occurred in the dosimeters during the exposure time (30 minutes).…”

Section: Dosimetrymentioning

confidence: 99%

Evaluation of the distribution of absorbed dose in child phantoms exposed to diagnostic medical x rays

Chen¹,

Poston²,

Warner³

1978

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“…Mansfield and Suntharalingam 1976, Knoos et a1 1986, Cross et a1 1992) and for in vivo dosimetry on patients (e.g. Gooden and Brickner 1972. Kron et a1 1993b).…”

Section: Introductionmentioning

confidence: 99%

“…CyglerandRoss 1988,Feist 1988,Hamersetnl 1991, see e.g. Gooden andBrickner 1972, Mansfield andSuntharalingam 1976, Kron et a1 1990).…”

Section: Introductionmentioning

confidence: 99%

Thermoluminescence dosimetry of therapeutic X-rays with LiF ribbons and rods

1993

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Exhuded LiF ribbons (3.1 x 3.1 x 0.9 mm') and rods (6 x 1 x I mm3) we commonly used thermoluminescence dosimeters (n dosimeters) for clinical dosimetry in radiotherapy. The dose distribution in these crystals was investigated in a 6 MV x-ray beam using s d e z LiF n dosimeter types (thin ribbons with a thickness of 0.14 mm and small cubes with 1 nun side length). Using the thin ribbons, the effective depth of measurement in the normal ribbons was found to be shifted towards the surface. Measuring on the surface of a solid water phantom in a IO x 10 emz field it was found to be at a depth of 0.4 mm as compared to the physical centre of the ribbons of 0.44 mm. In the investigations with small cubes assembled in form of ribbons and rods it was found that a higher &se was deposited in the centre of the ribbons and mds. Accordingly it was found that n. dosimeters in close contact w i t h each other increase their respective reading. Using two ribbons in contact with each other on the surface of a phantom leads to an overestimation of dose of about 1%. The specific dose response of LiF increases with dosimeter size. this is most likely due to increased e l m " scatter from the additional LiF material with density higher than unity. This emphasizes the role of n dosimeters as relative dosimeters where siandards of equal size and geamey should be used to evaluate the readings.

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The Routine Use of Thermoluminescence Dosimetry for Radiation Therapy

Cited by 13 publications

References 5 publications

Occupational radiation exposure of orthopedists at different locations during pedicle screw insertion: An anthropomorphic phantom study

Occupational radiation exposure of orthopedists at different locations during pedicle screw insertion: An anthropomorphic phantom study

Evaluation of the distribution of absorbed dose in child phantoms exposed to diagnostic medical x rays

Thermoluminescence dosimetry of therapeutic X-rays with LiF ribbons and rods

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