EP-1473: Neutron track detector for photo neutron measurements from high energy medical linear accelerator

2014 ◽  
Vol 111 ◽  
pp. S150
Author(s):  
S. Cyriac ◽  
A. Kummali ◽  
M. MM ◽  
G.R. Raman
Keyword(s):  
Linear Accelerator ◽  
High Energy ◽  
Track Detector ◽  
Medical Linear Accelerator

scholarly journals Analysis of Photo Neutron Dose to Patient from a 15 MV Linear Accelerator

2019 ◽  
Vol 8 (2S4) ◽  
pp. 903-912
Keyword(s):  
Linear Accelerator ◽  
Radiation Treatment ◽  
High Energy ◽  
Track Detector ◽  
Neutron Production ◽  
Nuclear Track Detector ◽  
Neutron Spectra ◽  
Medical Linear Accelerator ◽  
Major Reaction ◽  
Processing Software

Medical Linear Accelerator produces high-intensity bremsstrahlung beam, with typical energy ranges from 4 to 18MV for treatment purposes. The materials including patient exposed to this high energy spectrum lead to a photonuclear reaction in them. In these Photon energy domains, photo neutron production (n, p, and γ, n) is the major reaction channel. This is important as Carbon, Oxygen, Hydrogen, and Nitrogen are the predominant elements in a typical human being and having low photon neutron threshold. Apart from this, the equipment involved in a radiation treatment including Head, Couch, immobilization accessories, etc contributes to photo neutron production. The present study was recorded and analyzed the photo neutron spectra due to 15 MV medical linear accelerator using CR-39 Solid State Nuclear Track Detector and image processing software.

scholarly journals The Influence of Brass Compensator Thickness and Field Size on Neutron Contamination Spectrum in 18MV Elekta SL 75/25 Medical Linear Accelerator with and without Flattening Filter: A Monte Carlo Study

2018 ◽  
Vol 8 (3Sep) ◽  
Author(s):  
A S Talebi ◽  
M Maleki ◽  
P Hejazi ◽  
M Jadidi ◽  
R Ghorbani
Keyword(s):  
Monte Carlo ◽  
Linear Accelerator ◽  
Monte Carlo Study ◽  
High Energy ◽  
Nonparametric Tests ◽  
Primary Electron ◽  
Field Size ◽  
Dose Ratio ◽  
Medical Linear Accelerator ◽  
Flattening Filter

BackgroundOne of the most significant Intensity Modulated Radiation Therapy treatment benefits is a high target to normal tissue dose ratio. To improve this advantage, an additional accessory such as a compensator is used to delivering doses. Compensator-based IMRT treatment is usually operated with an energy higher than 10 MV. Photoneutrons, which have high linear energy transfer and radiobiological effectiveness, are produced by colliding high-energy photon beams with linear accelerator structures, then they deliver the unwanted doses to patients and staff. Therefore, the neutron energy spectra should be determined in order to calculate and reduce the photoneutron risk.Objective: We have conducted a comprehensive and precise study on the influence of brass compensator thickness and field size on neutron contamination spectrum in an Elekta SL 75/25 medical linear accelerator with and without the flattening filter by Monte Carlo method.Materials and Methods: MCNPX MC Code version 2.6.0 was utilized to simulate the detailed geometry of Elekta SL 75/25 head components based on Linac’s manual. This code includes an important feature to simulate the photo-neutron interactions. Photoneutrons spectrum was calculated after the Linac output benchmarking based on tuning the primary electron beam.Results and Conclusion: Based on the Friedman and Wilcoxon nonparametric tests results (P<0.05), photoneutron fluence directly depends on the field size and compensator thickness. Moreover, the unflattened beam provides lower photoneutron fluence than the flattened beam. Photoneutrons fluence is not negligible in compensator-based IMRT treatment. However, in order to optimize treatment plans, this additional and unwanted dose must be accounted for patients.

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

2010 ◽  
Vol 45 (3-6) ◽  
pp. 739-741 ◽  
Author(s):  
Fang-Yuh Hsu ◽  
Ya-Ling Chang ◽  
Mu-Tai Liu ◽  
Sheng-Shien Huang ◽  
Cheng-Ching Yu
Keyword(s):  
Linear Accelerator ◽  
High Energy ◽  
Dose Estimation ◽  
Medical Linear Accelerator

scholarly journals Measurements of Neutron Activation and Dose Rate Induced by High-Energy Medical Linear Accelerator

2021 ◽  
Vol 32 (4) ◽  
pp. 145-152
Author(s):  
Na Hye Kwon ◽  
Young Jae Jang ◽  
Jinsung Kim ◽  
Kum Bae Kim ◽  
Jaeryong Yoo ◽  
...  
Keyword(s):  
Neutron Activation ◽  
Dose Rate ◽  
Linear Accelerator ◽  
High Energy ◽  
Medical Linear Accelerator

Imaging of produced light in water during high energy electron beam irradiations from a medical linear accelerator

2018 ◽  
Vol 116 ◽  
pp. 1-9 ◽  
Author(s):  
Seiichi Yamamoto ◽  
Kuniyasu Okudaira ◽  
Fumitaka Kawabata ◽  
Takayoshi Nakaya ◽  
Hiroshi Oguchi
Keyword(s):  
Electron Beam ◽  
Linear Accelerator ◽  
High Energy ◽  
Energy Electron ◽  
High Energy Electron ◽  
Medical Linear Accelerator

scholarly journals Photoneutron spectrometry by novel multi-directional spherical neutron spectrometry system

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Mehdi Sohrabi ◽  
Amir Hakimi
Keyword(s):  
Linear Accelerator ◽  
Low Cost ◽  
Science And Technology ◽  
High Energy ◽  
High Dose ◽  
X Rays ◽  
Neutron Spectrometry ◽  
Medical Linear Accelerator ◽  
Technology Applications ◽  
Different Diameters

AbstractNeutron spectrometry in science and technology applications in general and accurate exotic photoneutron (PN) dosimetry of cancer patients undergoing high-dose high-energy X-rays therapy in medical accelerators in particular is of vital need. In this study, a novel passive multi-directional multi-detector neutron spectrometry system was developed and home-made using 6 polycarbonate/10B detectors on 6 sides of polyethylene (PE) cubes used bare and also embedded at center of PE spheres of 8 different diameters. The system provided well-resolved unfolded directional PN spectra showing thermal and fast PN peaks of 6 sides and mean spectrum in 5 field sizes at isocenter and other locations in 18 MV Siemens ONCOR medical linear accelerator bunker. The neutron spectrometry system developed has unique characteristics such as being simple, efficient, low cost, practical, and insensitive to low-LET radiation with well-resolved directional and mean spectra easily applicable in medicine, health, environment, science and technology in developing and developed laboratories.

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