An alpha-gamma coincidence spectrometry (AGCS) system was developed at the International Atomic Energy Agency's (IAEA) Safeguards Analytical Laboratory (SAL) in order to improve the detection of alpha-gamma emitting radionuclides of relevance for safeguards, such as (239)Pu and (241)Am. The AGCS design was based upon a linear gate, whose resolving time is dependent upon the amplifiers' shaping time constants (STC). A coincidence spectrum of a Pu/Am sample was acquired which showed that the AGCS system could be utilized in safeguards measurements.
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http://dx.doi.org/10.1016/j.apradiso.2009.04.022 | DOI Listing |
Appl Radiat Isot
September 2023
Unit of Nuclear Engineering, Ben-Gurion University of the Negev, Beer-Sheva, 8410501, Israel. Electronic address:
The absolute intensity for the 803-keV γ ray of Po was evaluated by α-γ coincidence technique. A liquid sample with a known amount of Po embedded in scintillation fluid was measured in a coincidence-based system that comprises a Liquid Scintillator (LS) detector and a High-Purity Germanium (HPGe) detector. A photo-reflector assembly that contains the Po sample provides 100% efficiency for detecting the α particles.
View Article and Find Full Text PDFAppl Radiat Isot
August 2023
Unit of Nuclear Engineering, Ben-Gurion University of the Negev, Beer-Sheva, 8410501, Israel.
A ground-level prototype system for low-background measurements was developed and tested. The system consists of a high-purity germanium (HPGe) detector used for detecting γ rays and coupled to a liquid scintillator (LS) used for detecting α and β particles. Both detectors are surrounded by shielding materials and anti-cosmic detectors ("veto") used to suppress background events.
View Article and Find Full Text PDFActa Crystallogr B Struct Sci Cryst Eng Mater
June 2020
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation.
A pure crystallogeometrical approach is proposed for predicting orientation relationships, habit planes and atomic structures of the interfaces between phases, which is applicable to systems of low-symmetry phases and epitaxial thin film growth. The suggested models are verified with the example of epitaxial growth of α-, γ- and β-FeSi silicide thin films on silicon substrates. The density of near-coincidence sites is shown to have a decisive role in the determination of epitaxial thin film orientation and explains the superior quality of β-FeSi thin grown on Si(111) over Si(001) substrates despite larger lattice misfits.
View Article and Find Full Text PDFAppl Radiat Isot
June 2020
National Physical Laboratory, Hampton Road, Teddington, Middlesex, TW11 0LW, United Kingdom.
Pa is the longest-lived decay product in the U decay chain and precise standards of this radionuclide are required to enable accurate, traceable measurements in nuclear dating applications such as geochronometry and nuclear forensics. Three independent techniques were used at NPL to determine the activity per unit mass of a freshly separated Pa solution as part of an international CCRI(II) comparison: CCRI(II)-K2.Pa-231.
View Article and Find Full Text PDFAppl Radiat Isot
April 2018
Laboratorio de Metrología de Radiaciones Ionizantes, CIEMAT, Avenida Complutense, 40, 28040 Madrid, Spain.
Gamma-ray emission probabilities for Am were published in 1996. Three new gamma transitions were then found: 46.84, 98.
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