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

Shielding evaluation of a medical linear accelerator vault in preparation for installing a high-dose rate 252Cf remote afterloader

2005 ◽  
Vol 113 (4) ◽  
pp. 428-437
Author(s):  
C. S. Melhus ◽  
M. J. Rivard ◽  
J. KurKomelis ◽  
C. B. Liddle ◽  
F. X. Massé
Keyword(s):  
Dose Rate ◽  
Linear Accelerator ◽  
High Dose Rate ◽  
High Dose ◽  
Medical Linear Accelerator

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.

scholarly journals Open beam dosimetric characteristics of True Beam medical linear accelerator with flattening filter (WFF) and flattening filter free (FFF) beam

2018 ◽  
Vol 24 (2) ◽  
pp. 79-89 ◽  
Author(s):  
Karthick Raj Mani ◽  
Md Anisuzzaman Bhuiyan ◽  
Md. Shakilur Rahman ◽  
S. M. Azharur Islam
Keyword(s):  
Dose Rate ◽  
Linear Accelerator ◽  
Maximum Dose ◽  
Published Data ◽  
Depth Dose ◽  
Medical Linear Accelerator ◽  
Flattening Filter Free ◽  
Dosimetric Data ◽  
Flattening Filter ◽  
Maximum Dose Rate

Abstract True Beam medical linear accelerator is capable of delivering flattening filter free (FFF) and with flattening filter (WFF) photon beams. True Beam linear accelerator is equipped with five photon beam energies (6 FFF, 6 WFF, 10 FFF, 10 WFF and 15 WFF) as well as six electron beam energies (6 MeV, 9 MeV, 12 MeV, 15 MeV and 18 MeV). The maximum dose rate for the 6 WFF, 10 WFF and 15 WFF is 600 MU/min, whereas 6 FFF has a maximum dose rate of 1400 MU/min and 10 FFF with a maximum dose rate of 2400 MU/min. In this report we discussed the open beam dosimetric characteristics of True Beam medical linear accelerator with FFF and WFF beam. All the dosimetric data (i.e. depth dose, cross-line profiles, diagonal profiles, output factors, MLC transmission, etc.) for 6 MV, 6 FFF, 10 MV, 10 FFF and 15 MV were measured and compared with the published data of the True Beam. Multiple detectors were used in order to obtain a consistent dataset. The measured data has a good consistency with the reference golden beam data. The measured beam quality index for all the beams are in good agreement with the published data. The percentage depth dose at 10 cm depth of all the available photon beams was within the tolerance of the Varian acceptance specification. The dosimetric data shows consistent and comparable results with the published data of other True Beam linear accelerators. The dosimetric data provide us an appreciated perception and consistent among the published data and may be used for future references.

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

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

SU-FF-T-296: Modeling to Characterize Neutron Activation Products in a Medical Linear Accelerator

2007 ◽  
Vol 34 (6Part12) ◽  
pp. 2469-2469
Author(s):  
B Bednarz ◽  
V Taranenko ◽  
X Xu
Keyword(s):  
Neutron Activation ◽  
Linear Accelerator ◽  
Medical Linear Accelerator ◽  
Activation Products
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