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Tosaki, Y.

Paper Title Page
TU-06 Progress of an Accelerator Mass Spectometry System on the TSUKUBA 12UD Pelletron Tandem Accelerator 49
 
  • K. Sasa, T. Amano, N. Kinoshita, Y. Nagashima, K. Sueki, T. Takahashi, Y. Tosaki, Y. Yamato
    UTTAC University of Tsukuba, Tsukuba
  • H. Matsumura, B. Bessho
    KEK/RSC, Tsukuba
  • Y. Matsushi
    Tokyo University/MALT, Tokyo
 
 

Funding: Work supported by Grants-in-Aid for Scientific Research Programs of the Ministry of Education, Culture, Sports, Science and Technology, Japan.


The 12UD Pel­letron tan­dem ac­cel­er­a­tor was in­stalled at the Uni­ver­si­ty of Tsuku­ba in 1975. In re­cent years, the main re­search field of the 12UD Pel­letron tan­dem ac­cel­er­a­tor has shift­ed to ac­cel­er­a­tor mass spec­trom­e­try (AMS) re­search from nu­cle­ar physics. AMS is an ul­tra­sen­si­tive tech­nique for the study of long-lived ra­dioiso­topes, and sta­ble iso­topes at very low abun­dances. The high ter­mi­nal volt­age is an ad­van­tage in the de­tec­tion of heavy ra­dioiso­topes. It is im­por­tant for sen­si­tive mea­sure­ments of heavy ra­dioiso­topes that back­ground in­ter­fer­ence of their sta­ble iso­bars are sup­pressed by AMS mea­sure­ments. With the mul­ti-nu­clide AMS sys­tem at the Uni­ver­si­ty of Tsuku­ba (Tsuku­ba AMS sys­tem), we are able to mea­sure long-lived ra­dioiso­topes of 14C, 26Al, 36Cl and 129I by em­ploy­ing a molec­u­lar pilot beam method that sta­bi­lize the ter­mi­nal volt­age with 0.1% ac­cu­ra­cy. Much progress has been made in the de­vel­op­ment of new AMS tech­niques for the Tsuku­ba AMS sys­tem. As for 36Cl AMS, 36Cl9+ at 100 MeV is used for AMS mea­sure­ments. The stan­dard de­vi­a­tion of the fluc­tu­a­tion is typ­i­cal­ly ± 2%, and the ma­chine back­ground level of 36Cl/Cl is lower than 1 × 10-15. This re­port pre­sents the overview and progress of the Tsuku­ba AMS sys­tem.

 

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