Dose estimation of the neutrons induced by the high energy medical linear accelerator using dual-TLD chips

Hsu, F.Y.; Chang, Y. S.; Liu, Mu-Tai; Huang, Shuan Yu; Yu, Cheng‐Ching

doi:10.1016/j.radmeas.2010.02.010

Cited by 12 publications

(2 citation statements)

References 3 publications

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“…Under certain circumstances, passive neutron detectors, such as activation foils and thermoluminescence dosimeters (TLD), may be preferred. A combination of TLD-600/TLD-700 has been used to measure neutron doses in radiotherapy treatment rooms [ 30 , 31 ]. Activation foils have also been used as standalone detectors for neutron fluence measurement [ 32 ].…”

Section: Resultsmentioning

confidence: 99%

Photoneutrons and Gamma Capture Dose Rates at the Maze Entrance of Varian TrueBeam and Elekta Versa HD Medical Linear Accelerators

Suliman

Khouqeer

Mayhoub

2023

Toxics

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Herein, we evaluated the neutron and gamma capture dose equivalent rates at the maze entrance of Varian TrueBeam and Elekta Versa HD™ medical linear accelerators (linacs) using experimental measurements as well as empirical calculations. Dose rates were measured using calibrated neutron and gamma area survey meters placed side-by-side at the measurement point of interest. Measurements were performed at a source-to-detector distance of 100 cm, with a 10 × 10 cm2 field size therapeutic X-ray beam, and a 30 × 30 × 15 cm3 solid water patient equivalent phantom, with a linac operating at 15, 10 MV, and 10 MV flattened filter-free (FFF). Dose rates were also measured at different points at the centerline along the maze towards the maze entrance. The measured dose equivalent rates at the maze entrance were comparable to those reported in the literature. The dose rates along the maze decreased exponentially towards the maze entrance and were significant for short maze lengths. The evaluated empirical methods for estimating neutron dose rates at the maze entrance of a linac proposed by Kersey, the modified Kersey method and Falcão method, agree by a factor of two from the experimental measurements. The results revealed vital radiation protection considerations owing to neutron contamination in external beam therapy.

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Section: Resultsmentioning

confidence: 99%

Photoneutrons and Gamma Capture Dose Rates at the Maze Entrance of Varian TrueBeam and Elekta Versa HD Medical Linear Accelerators

Suliman

Khouqeer

Mayhoub

2023

Toxics

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“…Radiotherapy with medical linear accelerator, LINAC, is a common method for treatment cancer (Hsu et al, 2010). High energy beams (E>10 MV) are used for treatment deep tumors.…”

Section: Introductionmentioning

confidence: 99%

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Talebi

Hejazi

Jadidi

et al. 2016

Int. J. Adv. Biol. Biomed. Res.

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Word or Tex form) to their personal website or institutional repository. Authors requiring further information regarding CASRP΄s archiving and manuscript policies encouraged to visit: http://www.casrp.co.uk/journals Abstract Medical linear accelerators are one of the most widespread methods for cancer treatment. Despite their advantages, unwanted photoneutrons are produced by high energy linacs. This photoneutrons are as undesired doses to patients and a significant problem for radiation protection of the staffs and patients. Photoneutrons radiological risk must be evaluated because of their high LET and range.in order to achieving this aim, photoneutron spectrum are calculated. The head of linac and a common treatment room was simulated by the MC code of MCNPX. Photoneutron spectrum was calculated in different field sizes, distances from isocenter and different cases (with and without structures and materials such as flattening filter, compensator, air and treatment room walls). The inclusion of the flattening filter and compensator had not any effects on shaping the photoneutron spectrum but neutron fluence and the average neutron energy are reduced obviously. Also effect of air on photoneutron spectrum was negligible. The calculation of photoneutron spectrum with concrete walls show that the component of fast neutrons is decreased and thermal neutrons are increased due to the room-return. In this case, with increasing distance from isocenter, fast neutrons are decreased and thermal neutrons are increased. As the field size is increased from 5×5 to 15×15 cm 2 , the neutron flux is increased clearly in isocenter. The neutrons flux are decreased near the door due to maze effect. The photoneutron spectrum investigation and risk estimation due to inclusion of neutron contamination in treatment room prevent from secondary cancer mortality.

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2.2.1 Ionizing Radiation

Kasch

2012

Fundamentals and Data in Radiobiology, Radiation Biophysics, Dosimetry and Medical Radiological Protection

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Dose estimation of the neutrons induced by the high energy medical linear accelerator using dual-TLD chips

Cited by 12 publications

References 3 publications

Photoneutrons and Gamma Capture Dose Rates at the Maze Entrance of Varian TrueBeam and Elekta Versa HD Medical Linear Accelerators

Photoneutrons and Gamma Capture Dose Rates at the Maze Entrance of Varian TrueBeam and Elekta Versa HD Medical Linear Accelerators

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2.2.1 Ionizing Radiation

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