Absolute activity determination of 198Au solid source using 4πβ -γ coincidence counting corrected by Monte-Carlo calculation

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dc.contributor.authorMo, Len_AU
dc.contributor.authorWu, HYen_AU
dc.contributor.authorBaldock, Cen_AU
dc.date.accessioned2010-08-24T01:27:21Zen_AU
dc.date.available2010-08-24T01:27:21Zen_AU
dc.date.issued2007-06en_AU
dc.date.statistics2007-06en_AU
dc.description.abstractFor 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)en_AU
dc.identifier.citationMo, 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. doi:10.1109/TNS.2007.895504en_AU
dc.identifier.govdoc2525en_AU
dc.identifier.issn0018-9499en_AU
dc.identifier.issue3en_AU
dc.identifier.journaltitleIEEE Transactions on Nuclear Scienceen_AU
dc.identifier.pagination677-683en_AU
dc.identifier.urihttp://dx.doi.org/10.1109/TNS.2007.895504en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/2325en_AU
dc.identifier.volume54en_AU
dc.language.isoenen_AU
dc.publisherInstitute of Electrical and Electronics Engineers (IEEE)en_AU
dc.subjectMonte Carlo Methoden_AU
dc.subjectCoincidence methodsen_AU
dc.subjectElectron detectionen_AU
dc.subjectNeutron fluxen_AU
dc.subjectGamma detectionen_AU
dc.subjectOPAL Reactoren_AU
dc.titleAbsolute activity determination of 198Au solid source using 4πβ -γ coincidence counting corrected by Monte-Carlo calculationen_AU
dc.typeJournal Articleen_AU
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