Browsing by Author "Sacchi, E"

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    14C in uranium and thorium minerals: a signature of cluster radioactivity?
    (Springer Nature, 1999-06-01) Bonetti, R; Guglielmetti, A; Poli, G; Sacchi, E; Fink, D; Hotchkis, MAC; Jacobsen, GE; Lawson, EM; Hua, Q; Smith, AM; Tuniz, C
    Various uranium and thorium minerals have been analysed with accelerator mass spectrometry to determine their 14C content. It is found that, whenever the contribution from secondary reactions such as the 11B(α,p)14C is sufficiently low, the 14C concentration is consistent with that expected from 14C (spontaneous) cluster radioactivity from radium isotopes of the uranium and thorium natural series. © Springer-Verlag 1999
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    AMS measurement of 129I, 36C1 and 14C in underground waters from Mururoa and Fangataufa atolls
    (Elsevier, 2000-10) Jacobsen, GE; Hotchkis, MAC; Fink, D; Child, DP; Tuniz, C; Sacchi, E; Levins, DM; Povinec, PP; Mulsow, S
    AMS analyses of 36Cl, 129I and 14C in underground water have been performed as part of IAEA’s assessment of the radiological situation at Mururoa and Fangataufa atolls. The samples consisted of waters from monitoring wells, and from two cavity-chimneys created by underground nuclear tests. The water samples from the monitoring wells contained varying concentrations of radionuclides, with the highest concentrations of radionuclides found in the two test cavity-chimneys. A comparison of the concentrations of radionuclides determined by AMS, 36Cl and 129I, and with radionuclides determined using conventional methods, 3H, 90Sr and 137Cs, shows a reasonable correlation. However, some differences in behaviour, mainly attributed to differences in the sorption characteristics of the elements, are discernible. The concentrations of radionuclides in the underground environment were used to validate geosphere transport models. © 2000 Elsevier Science B.V.
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    Recent developments at the ANTARES AMS Centre
    (Elsevier, 1996-11-11) Smith, AM; Fink, D; Hotchkis, MAC; Jacobsen, GE; Lawson, EM; Tuniz, C; Sacchi, E; Louvat, D; Zuppi, GM; Bonetti, R
    In conjunction with an extensive radiocarbon program, ANTARES has also carried out AMS measurement of the radioisotopes 26Al and 36Cl with the recent addition of 129I. Development of an AMS measurement capability for 10Be and for the actinides is underway. These projects pose a range of technical challenges both in spectrometer performance and in sample preparation. This paper discusses the special aspects of the facility that have been developed to meet these needs, with emphasis on 36Cl, 129I and plans for future actinide measurements. © 1996 Elsevier B.V.