Radiation protection aspects of a new high-energy linear accelerator

Journal Article · Tue Jan 01 00:00:00 EST 1985 · Med. Phys.; (United States)

DOI:https://doi.org/10.1118/1.595793· OSTI ID:6246538

O'Brien, P; Michaels, H B; Gillies, B; Aldrich, J E; Andrew, J W

The Therac-25 is a new 25-MeV linear accelerator manufactured by Atomic Energy of Canada, Ltd. The first two units have recently been installed in Toronto, Ontario and Halifax, Nova Scotia. Calculations and measurements of primary and secondary radiation levels were made. Neutron dose-equivalent rates were measured inside and outside the room. The maximum leakage rate at 1 m from the accelerator target was 0.4% Sv per peak photon Gy. The tenth value layer for neutrons from the Therac-25, at the entrance to a one-legged maze was found to be 5.5 cm of polyethylene. Measurements were done to estimate daily technologist exposure due to induced activity in the treatment room.

• Research Organization: Division of Clinical Physics, Toronto-Bayview Clinic, Ontario Cancer Foundation, Toronto, Ontario M4N 3M5, Canada
• OSTI ID: 6246538
• Journal Information: Med. Phys.; (United States), Vol. 12:1
• Country of Publication: United States
• Language: English

Related Subjects

61 RADIATION PROTECTION AND DOSIMETRY
RADIOLOGICAL PERSONNEL
RADIATION PROTECTION
RADIOTHERAPY
LINEAR ACCELERATORS
DOSE EQUIVALENTS
DOSE RATES
ACCELERATORS
MEDICAL PERSONNEL
MEDICINE
NUCLEAR MEDICINE
PERSONNEL
RADIOLOGY
THERAPY
655001* - Medical Physics- Radiation Protection Standards