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Optimization of 236U AMS at CIRCE

Published online by Cambridge University Press:  18 July 2016

M De Cesare ,
Y Guan ,
F Quinto ,
C Sabbarese ,
N De Cesare ,
A D'Onofrio ,
L Gialanella ,
A Petraglia ,
V Roca  and
F Terrasi
M De Cesare*
Affiliation:
CIRCE, INNOVA and Dipartimento di Scienze Ambientali, Seconda Università di Napoli, Caserta, Italy INFN Sezione di Napoli, Napoli, Italy
Y Guan
Affiliation:
CIRCE, INNOVA and Dipartimento di Scienze Ambientali, Seconda Università di Napoli, Caserta, Italy College of Physics Science and Technology, Guangxi University, Nanjing 530004, China ICTP, Trieste, Italy
F Quinto
Affiliation:
CIRCE, INNOVA and Dipartimento di Scienze Ambientali, Seconda Università di Napoli, Caserta, Italy
C Sabbarese
Affiliation:
CIRCE, INNOVA and Dipartimento di Scienze Ambientali, Seconda Università di Napoli, Caserta, Italy
N De Cesare
Affiliation:
CIRCE, INNOVA and Dipartimento di Scienze Ambientali, Seconda Università di Napoli, Caserta, Italy INFN Sezione di Napoli, Napoli, Italy
A D'Onofrio
Affiliation:
CIRCE, INNOVA and Dipartimento di Scienze Ambientali, Seconda Università di Napoli, Caserta, Italy INFN Sezione di Napoli, Napoli, Italy
L Gialanella
Affiliation:
INFN Sezione di Napoli, Napoli, Italy
A Petraglia
Affiliation:
CIRCE, INNOVA and Dipartimento di Scienze Ambientali, Seconda Università di Napoli, Caserta, Italy
V Roca
Affiliation:
INFN Sezione di Napoli, Napoli, Italy Dipartimento di Scienze Fisiche, Università Federico II, Napoli, Italy
F Terrasi
Affiliation:
CIRCE, INNOVA and Dipartimento di Scienze Ambientali, Seconda Università di Napoli, Caserta, Italy INFN Sezione di Napoli, Napoli, Italy
*
Corresponding author. Email: [email protected]
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Abstract

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Actinide isotopes are present in environmental samples at ultra-trace levels (236U concentration is quoted to be on the order of pg/kg or fg/kg). Their detection requires the resolution of mass spectrometry (MS) techniques, but only accelerator mass spectrometry (AMS) has the sensitivity required. In order to perform the isotopic ratio measurements of actinides, such as 236U/238U, an upgrade of the Center for Isotopic Research on Cultural and Environmental Heritage accelerator (CIRCE) in Caserta, Italy, has been performed. The system was originally equipped for radiocarbon AMS measurements. The main difficulty of AMS measurement of 236U is the intense neighboring beam of 238U. Although most of the 238U ions are suppressed by means of magnetic and electrostatic elements, a small fraction of this intense beam can interfere with the rare isotopes. This paper reports the preliminary results of the 236U/238U isotopic ratio measurement limit (<5.6 x 10–11), aimed also to better understand the origin of background ions. For this purpose, a large 16-strip silicon detector providing spatial resolution has been used. In addition, calculations to assess the performance of the system obtained by adding a high-resolution time of flight-energy (TOF-E) detector are discussed.

Type
Accelerator Mass Spectrometry
Information
Radiocarbon , Volume 52 , Issue 2: 20th Int. Radiocarbon Conference Proceedings , 2010 , pp. 286 - 294
Copyright
Copyright © 2010 by the Arizona Board of Regents on behalf of the University of Arizona 

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