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Please use this identifier to cite or link to this item: http://apo.ansto.gov.au/dspace/handle/10238/2325

Title: Absolute activity determination of 198Au solid source using 4πβ -γ coincidence counting corrected by monte-carlo calculation.
Authors: Mo, L
Wu, HY
Baldock, C
Keywords: Monte Carlo Method
Coincidence Methods
Electron Detection
Neutron Flux
Gamma Detection
OPAL Reactor
Issue Date: Jun-2007
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Citation: Mo, L., Wu, H. Y., & Baldock, C. (2007). Absolute activity determination of 198Au solid source using 4πβ -γ coincidence counting corrected by monte-carlo calculation. IEEE Transactions on Nuclear Science, 54(3), 677-683.
Abstract: For the commissioning process of the OPAL nuclear reactor of the Australian Nuclear Science and Technology Organization (ANSTO), the thermal neutron flux is measured through the activity measurement of an activated Au wire, Au-Al (0.112% of Au) alloy wire and Au foil. The absolute activities of 198Au in the form of Au wire, Al-Au wire and Au foil were determined using the conventional 4pibeta-gamma coincidence-counting method. Monte Carlo simulation technique was employed to simulate the complicated absorption and attenuation processes of electrons and gamma photon interactions with the surrounding materials. The Monte Carlo calculated probabilities of escape beta particles, internal conversion electrons and photon-interaction generated photoelectrons and Compton electrons were used to determine the correction term of the coincidence equation. The corrections for the Au wire (length: 8.000 mm, radius: 0.064 mm), Al-Au wire (length: 7.690 mm, radius: 0.255 mm) and Au foil (thickness: 0.025 mm, radius: 3.000 mm) were found to be 5.2%plusmn0.1%, 2.6%plusmn0.1% and 4.2%plusmn0.2% respectively. The study demonstrates that the Monte Carlo calculation for the correction term of the coincidence equation can be applied to the absolute activity determination of radionuclides with well-defined source geometries with an uncertainty of better than 1%. © 2007, Institute of Electrical and Electronics Engineers (IEEE)
URI: http://dx.doi.org/10.1109/TNS.2007.895504
http://apo.ansto.gov.au/dspace/handle/10238/2325
ISSN: 0018-9499
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