4-6 February 2019
Centara Grand at Central Ladprao
Asia/Bangkok timezone
Deadline for full paper revision: 21 May 2019.

Application of Compact Disc for Photo-Neutron Measurement Generated from High Energy Photon Irradiated by 10 MV Medical Linear Accelerator

5 Feb 2019, 14:40
1h 10m
Centara Grand at Central Ladprao

Centara Grand at Central Ladprao

Chatuchak, Bangkok 10900, Thailand
Poster Medical Poster 2

Speaker

Mr Porama Thepsiri (Faculty of Associated Medical Sciences Chiang Mai University, Chiang Mai, Thailand )

Description

The high energy photon from medical linear accelerator (Linac) have been widely used for cancer treatment with radiotherapy. However, when high energy photon interact with Linac head components the undesirable neutrons contamination can be produced by photo-nuclear reaction. This work aims to evaluate photo-neutron dose generated from Linac 10 MV. The polycarbonate base layer of compact disc (CD) has been applied to neutron dosimetry by combining with polyethylene converter and boron converter for the fast neutrons and the thermal neutrons measurement, respectively. The pieces of CD track detector were irradiated with high energy photon from 10 MV Elekta Precise Linacs in the solid water phantom at depth of 0, 2.5, 5, 10, 15 and 20 cm, then etched with PEW solution (potassium hydroxide, ethanol and water) with ratio of 15: 45: 40 at various solution’s temperature and etching times. The neutron response of CD track detector, CR-39 track detector and MCNP simulation have been compared. The results showed that the shape of the fluence responses of neutron and the neutron dose equivalent of them were agreed. This CD track detector for neutron measurement system allows users to measure all energy ranges of neutrons produced in the radiotherapy room more easily.

Keywords: LINAC, Photo-Neutron, Neutron measurement, Compact disc, CR-39, MCNP

Primary author

Mr Porama Thepsiri (Faculty of Associated Medical Sciences Chiang Mai University, Chiang Mai, Thailand )

Co-author

Dr Chayanit Jumpee (Faculty of Associated Medical Sciences Chiang Mai University, Chiang Mai, Thailand )

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