Recent activities in neutron standardization at NMIJ/AIST
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چکیده
This report described recent activities on neutron standardization at the National Metrology Institute of Japan (NMIJ) in the National Institute of Advanced Industrial Science and Technology (AIST). The present status of our accelerator-based neutron field is described mainly on the development of monoenergetic neutron fluence standards [1-3]. Collaboration is in progress with the Japan Atomic Energy Agency (JAEA) aiming at the establishment of the high-energy (20 100 MeV) neutron standard field. We have also carried out studies on relative calibration of the neutron source emission rate between different source types [4] and on tiny thermal neutron sensors with gamma-ray suppression capability. In October 2006, the calibration and measurement capabilities were published for our standards on the quantities of fast monoenergetic neutrons fluence, thermal neutron fluence rate and neutron emission rate in the Appendix C of the BIPM key comparison database (KCDB). We are participating in the key comparison CCRI(III)-K8 on thermal neutron fluence measurements. We made the measurements with transfer instruments from November to December 2006 and returned them to the pilot laboratory in January 2007.
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تاریخ انتشار 2005