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

Determination of Neutron Generated in Self-Shielded Medical Cyclotron Facility

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

Speakers

Mr Tanapol Dachviriyakij (Office of Atoms for Peace , Ministry of Science and Technology )Ms Apisara Charoensri (Office of Atoms for Peace , Ministry of Science and Technology )

Description

HM-20S self-shielded medical cyclotron is used in PET radiopharmaceutical production. During operation, neutrons were generated by (p,n) reaction between primary beam and target or cyclotron’s part. High energy neutrons can penetrate or slow down and activate cyclotron’s component to be radionuclide. The dose from activated radionuclide will cause radiation exposure to cyclotron operators, radiopharmacists, maintenance workers and public. The purpose of this study is to measure generated neutrons in cyclotron facility at the Siriraj Cyclotron Center, for consideration of the radiation safety in routine operation and to predict radiation dose from activated components. Determination of neutron inside shielded area using neutron capture gamma ray of aluminum plates placed on positions, and HPGe spectrometer for counting gamma radiation. Inside and outside the cyclotron vault area neutrons were measured by using CR-39 track detector. The measured neutron fluxes inside cyclotron vault were 227, 160, 6.19, and 120 cm$^{-2}$s$^{-1}$/µAh on shielding wall and 338, 94.1, 35.9, and 65 cm$^{-2}$s$^{-1}$/µAh on vault’s wall. For outside cyclotron vault, the neutron fluxes were not more than background level. The predicted dose rate by measured neutron flux and activation calculation formula were less than 1 µSv/h after routine operation.

Primary authors

Mr Tanapol Dachviriyakij (Office of Atoms for Peace , Ministry of Science and Technology ) Ms Rujaporn Chanachai (Department of Radiology, Faculty of Medicine Siriraj Hospital, Mahidol University) Ms Malulee Tuntawiroon (Department of Radiology, Faculty of Medicine Siriraj Hospital, Mahidol University)

Co-author

Ms Apisara Charoensri (Office of Atoms for Peace , Ministry of Science and Technology )

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