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ANSTO Publications Online >
ANSTO Publications >
Scientific and Technical Reports >
Please use this identifier to cite or link to this item:
http://apo.ansto.gov.au/dspace/handle/10238/112
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| Title: | Australian Commonwealth standard of measurement for absorbed radiation dose. |
| Authors: | Urquhart, DF Johnson, EP Badger, WS |
| Issue Date: | Sep-1978 |
| Publisher: | Australian Nuclear Science and Technology Organisation |
| Abstract: | As an agent of the Commonwealth Scientific and Industrial Research Organization, the Australian Atomic Energy Commission (AAEC) is responsible for the maintenance of the Australian Commonwealth standard of absorbed dose. A graphite calorimeter was designed and built at the AAEC Research Establishment to provide such a standard for the dose absorbed in carbon from y- and X-ray beams with maximum photon energies above 500 keV. The calorimeter measures the dose averaged over the volume of a thermally insulated absorber disc of diameter 20 mm, thickness 3 mm and mass 1.7 g. The absorber and associated adiabatic and temperature controlled jackets are contained within a small graphite phantom of diameter 15 cm. The depth to the centre of the absorber is adjustable between 2.1 and 10 cm. By using a modified vacuum chamber window, the minimum depth can be reduced to 5 mm for use with high energy electron beams. The calorimeter has been in operation for more than 12 months and no change in its response to a 60Co source has been detected in that time. The precision of dose measurements is ± 0.3 per cent at a dose rate of 4.2 mGy s-' (25 rad min-'). Graphite and water phantoms have been made to enable portable working standards of absorbed dose in carbon and water to be calibrated against the primary standard. |
| URI: | http://apo.ansto.gov.au/dspace/handle/10238/112 |
| ISBN: | 0642596522 |
| Appears in Collections: | Scientific and Technical Reports |
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