AMS-12 Con e ence, 2011
180
FOR#P105 POSTER SESSION 2 Thu sday 24 h Ma ch, 1400 - 1540
Measu emen o Pu and U iso opes on he 1 MV AMS sys em a he Cen o
Nacional de Acele ado es
Chamizo E 1, Ga cía-León M 2, Ga cía-Teno io R 1, Ho chkis M 3
1 Cen o Nacional de Acele ado es (CNA), A da. Thomas Al a Edison 7, Isla de la Ca uja, 41092
Se ille, Spain,
2 Dp o. de Física A ómica Molecula y Nuclea , Uni e sidad de Se illa, P.O. Box 1065, 41080
Se ille, Spain,
3 Aus alian Nuclea Science and Technology O ganisa ion, Locked Bag 2001, Ki awee DC, NSW
2232, Aus alia
In he las decade, compac AMS sys ems ha e demons a ed hei po en ial o measu e ac inides
(236U, 239,240,244Pu, 237Np). Wi h an app op ia e de ec ion sys em, kinema ic il e s wi h enough
mass esolu ion, and a simple chemical p ocedu e, he de e mina ion o plu onium iso opes and
237Np a en i onmen al le els is cu en ly possible wi h his new gene a ion o acili ies wi h e en
be e pe o mance han wi h con en ional AMS sys ems. Howe e , he measu emen o 236U
(T1/2=23.4 My), p oduced by neu on cap u e on 235U, is s ill a challenge, due o he in e e ence
caused by 235U and 238U. In his wo k, we will explo e he possibili ies ha he 1 MV AMS sys em a
he CNA o e s o he measu emen o u anium iso opes a en i onmen al le els, in e ms o
de ec ion limi , e iciency, and p ecision. Conside ing he e y p omising 239Pu/238U mass
supp ession ac o achie ed wi h ou sys em, o abou 10-9, a limi ing 236U/238U a omic a io o
abou 10-11 was expec ed, app oaching he le els expec ed in na u al u anium. Howe e , o da e,
only he 10-9 le el has been ob ained, possibly due o he lack o an app op ia e u anium ma e ial.
Cu en ly, di e en na u al u anium ma e ials a e being s udied, in o de o elucida e he o igin o
he in e e ence. On he o he hand, we will discuss he s a us o he plu onium measu emen s a
ou acili y, based on he expe ience we ha e accumula ed in ecen yea s om he analysis o
di e en ma ixes o e a wide ange o plu onium concen a ions.