Loading...
Please wait, while we are loading the content...
Similar Documents
Optimization of$ ^{236}$U AMS at CIRCE
| Content Provider | Scilit |
|---|---|
| Author | D'Onofrio, A. Cesare, M. De Guan, Y. Quinto, F. Sabbarese, C. Gialanella, L. Petraglia, A. Roca, V. Terrasi, F. |
| Copyright Year | 2010 |
| Description | Actinide isotopes are present in environmental samples at ultra-trace levels $(^{236}$U 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$ ^{236}U/^{238}$U, an upgrade of the Center for Isotopic Research on Cultural and Environmental Heritage accelerator (CIRCE) in Caserta, Italy, has been performed. The system was originally equipped for radiocarbon AMS measurements. The main difficulty of AMS measurement of$ ^{236}$U is the intense neighboring beam of$ ^{238}$U. Although most of the$ ^{238}$U ions are suppressed by means of magnetic and electrostatic elements, a small fraction of this intense beam can interfere with the rare isotopes. This paper reports the preliminary results of the$ ^{236}U/^{238}$U 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. |
| Related Links | https://www.cambridge.org/core/services/aop-cambridge-core/content/view/840F926E9A219194894F4DA923E3DF0C/S003382220004532Xa.pdf/div-class-title-optimization-of-span-class-sup-236-span-u-ams-at-circe-div.pdf |
| Ending Page | 294 |
| Page Count | 9 |
| Starting Page | 286 |
| ISSN | 00338222 |
| e-ISSN | 19455755 |
| DOI | 10.1017/s003382220004532x |
| Journal | Radiocarbon |
| Issue Number | 2 |
| Volume Number | 52 |
| Language | English |
| Publisher | Cambridge University Press (CUP) |
| Publisher Date | 2010-01-01 |
| Access Restriction | Open |
| Subject Keyword | Radiocarbon Nuclear Energy and Engineering |
| Content Type | Text |
| Resource Type | Article |
| Subject | Earth and Planetary Sciences Archeology (arts and humanities) |
