Evaluation of neutron dose equivalent levels at the maze entrance of medical accelerator treatment rooms

Journal Article · Fri Mar 01 00:00:00 EST 1991 · Medical Physics; (United States)

DOI:https://doi.org/10.1118/1.596713· OSTI ID:5395998

McGinley, P H; Butker, E K ^[1]

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1. Emory Clinic, Division of Radiation Oncology, Atlanta, Georgia (USA)

This paper evaluates the accuracy of Kersey's method of calculation of the dose level due to photoneutrons at the maze entrance of medical accelerators. In this study measurements and calculations of the neutron dose equivalent were made for 13 medical accelerator facilities. The group of accelerators was composed of four different models from two manufacturers. The maze length for the treatment rooms varied from 3.0 to 8.54 m and 10 of the mazes had a single 90-deg turn with the remaining having two 90-deg turns. Moderated activation detectors and a portable neutron remmeter were used for measurements in the treatment room and maze, respectively. It was found that the maximum disagreement between the measured and calculated values was a factor of 2.3 with the calculated value exceeding the measured value. The majority of the measured values were within 25% of the calculated levels. It was concluded that Kersey's method is suitable for use in designing medical accelerator mazes.

• OSTI ID: 5395998
• Journal Information: Medical Physics; (United States), Vol. 18:2; ISSN 0094-2405
• Country of Publication: United States
• Language: English

Related Subjects

63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
NEUTRONS
DOSE EQUIVALENTS
RADIATION DOSES
CALCULATION METHODS
OCCUPATIONAL EXPOSURE
RADIATION MONITORING
RESEARCH REACTORS
BARYONS
DOSES
ELEMENTARY PARTICLES
FERMIONS
HADRONS
MONITORING
NUCLEONS
REACTORS
RESEARCH AND TEST REACTORS
560151* - Radiation Effects on Animals- Man