Study of 236U/238U ratio at CIRCE using a 16-strip silicon detector with a TOF system
1 Department of Nuclear Physics, Research School of Physics and Engineering, Australian National University, Canberra, ACT 2601, Australia
2 CIRCE, Department of Mathematic and Physics, II University of Naples, 81100 Caserta, Italy
a corresponding author with present address: Italian Aerospace Research Centre - CIRA, via Maiorise, 81043 Capua (CE), Italy. Email: firstname.lastname@example.org.
Published online: 6 April 2015
Accelerator Mass Spectrometry (AMS) is presently the most sensitive technique for the measurement of long-lived actinides, e.g. 236U and xPu isotopes. A new actinide AMS system, based on a 3-MV pelletron tandem accelerator, is operated at the Center for Isotopic Research on Cultural and Environmental Heritage (CIRCE) in Caserta, Italy. In this paper we report on the procedure adopted to increase the 236U abundance sensitivity as low as possible. The energy and position determinations of the 236U ions, using a 16-strip silicon detector have been obtained. A 236U/238U isotopic ratio background level of about 2.9×10−11 was obtained, summing over all the strips, using a Time of Flight-Energy (TOF-E) system with a 16-strip silicon detector (4.9×10−12 just with one strip).
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