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:5429847

Sundara Rao, I S; Naik, S B

A graphite calorimeter similar in size and shape to a Farmer type 0.6-cm3 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/ 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(-2)Gys-1). The absorbed dose to water at the calibration depth of 5 cm was standardized for our /sup 60/Co gamma bean, for a 60-cm SSD and 10 x 10 cm2 field. Farmer type ionizatin chambers were calibrated against the standardized absorbed dose. The overall accuracy in calibrating the ionization chambers was +/- 1.2%.

• Research Organization: Bhabha Atomic Reseach Centre, Trombay, India
• OSTI ID: 5429847
• Journal Information: Med. Phys.; (United States), Journal Name: Med. Phys.; (United States) Vol. 7:3; ISSN MPHYA
• Country of Publication: United States
• Language: English

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61 RADIATION PROTECTION AND DOSIMETRY
655003* -- Medical Physics-- Dosimetry
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