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|Title:||The Australian Commonwealth standard of measurement for absorbed radiation dose|
|Publisher:||Australian Atomic Energy Commission|
|Citation:||Urquhart, D. F., Johnson, E. P., & Badger, W. S. (1978). The Australian Commonwealth standard of measurement for absorbed radiation dose (AAEC/E455). Lucas Heights: Australian Atomic Energy Commission, Research Establishment.|
|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.|
|Gov't Doc #:||308|
|Appears in Collections:||Scientific and Technical Reports|
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