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

Rao I. S. Sundara | Zendy; Naik S. B. | Zendy

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

Author(s) -

Rao I. S. Sundara,

Naik S. B.

Publication year - 1980

Publication title -

medical physics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.473

H-Index - 180

eISSN - 2473-4209

pISSN - 0094-2405

DOI - 10.1118/1.594685

Subject(s) - ionization chamber , absorbed dose , dosimeter , calibration , imaging phantom , ionization , dosimetry , calorimeter (particle physics) , materials science , percentage depth dose curve , radiation , radiochemistry , irradiation , gamma ray , dose profile , nuclear medicine , physics , nuclear physics , optics , chemistry , ion , detector , medicine , quantum mechanics

A graphite calorimeter similar in size and shape to a Farmer type 0.6‐cm 3 ionization chamber was developed for direct measurement of absorbed dose at a specified depth in a water phantom irradiated by a beam of 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 (4×10 −2 Gy s −1 ). The absorbed dose to water at the calibration depth of 5 cm was standardized for our 60 Co gamma beam, for a 60‐cm SSD and 10×10 cm 2 field. Farmer type ionization chambers were calibrated against the standardized absorbed dose. The overall accuracy in calibrating the ionization chambers was ± 1.2%.

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