Graphite calorimeter in water phantom and calibration of ionization chambers in dose to water for /sup 60/Co gamma radiation

Journal Article · Thu May 01 04:00:00 EDT 1980 · Med. Phys.; (United States)

OSTI ID:5446290

Rao, I S.S.; Naik, S B

A graphite calorimeter similar in size and shape to a Farmer type 0.6-cm/sup 3/ ionization chamber was developed for direct measurement of absorbed dose at a specified depth in a water phantom irradiated by a beam of /sup 60/Co gamma radiation. The accuracy of the absorbed dose determined was estimated to be +- 1.1% at a dose level of 4 rad/s (4 x 10/sup -2/Gy s/sup -1/). The absorbed dose to water at the calibration depth of 5 cm was standardized for our /sup 60/Co gamma beam, for a 60-cm SSD and 10 x 10 cm/sup 2/ field. Farmer type ionization chambers were calibrated against the standardized absorbed dose. The overall accuracy in calibrating the ionization chambers was +- 1.2%.

• Research Organization: Radiological Standards Laboratory, Division of Radiological Protection, Bhabha Atomic Research Centre, Trombay, Bombay-400 085, India
• OSTI ID: 5446290
• Journal Information: Med. Phys.; (United States), Journal Name: Med. Phys.; (United States) Vol. 7:3; ISSN MPHYA
• Country of Publication: United States
• Language: English

Related Subjects

61 RADIATION PROTECTION AND DOSIMETRY
655003* -- Medical Physics-- Dosimetry
ACCURACY
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CALIBRATION
CALORIMETERS
COBALT 60
COBALT ISOTOPES
DEPTH DOSE DISTRIBUTIONS
DESIGN
DOSIMETRY
GAMMA DOSIMETRY
HYDROGEN COMPOUNDS
INTERMEDIATE MASS NUCLEI
INTERNAL CONVERSION RADIOISOTOPES
IONIZATION CHAMBERS
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
MEASURING INSTRUMENTS
MINUTES LIVING RADIOISOTOPES
MOCKUP
NUCLEI
ODD-ODD NUCLEI
OXYGEN COMPOUNDS
PHANTOMS
RADIATION DETECTORS
RADIATION DOSE DISTRIBUTIONS
RADIOISOTOPES
SPATIAL DOSE DISTRIBUTIONS
STRUCTURAL MODELS
WATER
YEARS LIVING RADIOISOTOPES