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Nationwide survey of cobalt-60 teletherapy dosimetry. Technical note

Technical Report ·
OSTI ID:5652543
;
Between September 1974 and December 1977 the National Bureau of Standards, in cooperation with the Bureau of Radiological Health, performed a study of the accuracy with which a prescribed absorbed dose of cobalt-60 gamma radiation is delivered to a specified point in a water phantom. Approximately two-thirds of the cobalt-60 teletherapy units in the U.S. were surveyed by mail, using a rugged thermoluminescence dosimetry system. The dose given by prticipants was evaluated from dosimeter response, and information supplied by participants was used to check their computations of the dose delivered. In this nationwide study, 83 percent of the units surveyed yielded dose interpretations within 5 percent of the requested dose, 13 percent yielded differences between 5 and 10 percent, and 4 percent of the dose interpretations differed by more than 10 percent from the dose requested. Sources of discrepancies are discussed, and the results of this survey are compared with those of other dosimetry surveys.
Research Organization:
National Bureau of Standards, Washington, DC (USA). Center for Radiation Research
OSTI ID:
5652543
Report Number(s):
PB-292111
Country of Publication:
United States
Language:
English

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550603 -- Medicine-- External Radiation in Therapy-- (1980-)
560151 -- Radiation Effects on Animals-- Man
61 RADIATION PROTECTION AND DOSIMETRY
62 RADIOLOGY AND NUCLEAR MEDICINE
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BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
COBALT 60
COBALT ISOTOPES
COMPARATIVE EVALUATIONS
DOSIMETRY
ELECTROMAGNETIC RADIATION
GAMMA DOSIMETRY
GAMMA RADIATION
INTERMEDIATE MASS NUCLEI
INTERNAL CONVERSION RADIOISOTOPES
IONIZING RADIATIONS
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
MEDICINE
MINUTES LIVING RADIOISOTOPES
MOCKUP
NUCLEAR MEDICINE
NUCLEI
ODD-ODD NUCLEI
PHANTOMS
QUALITY ASSURANCE
RADIATIONS
RADIOISOTOPES
RADIOLOGY
RADIOTHERAPY
STRUCTURAL MODELS
THERAPY
YEARS LIVING RADIOISOTOPES