Cross-correlation measurements with the EJ-299-33 plastic scintillator [electronic resource]

• Ngôn ngữ: eng
• Ký hiệu phân loại: 539.7 Atomic and nuclear physics
• Thông tin xuất bản: Washington, D.C. : Oak Ridge, Tenn. : United States. National Nuclear Security Administration ; Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 2014
• Mô tả vật lý: Size: p. 460-464 : , digital, PDF file.
• Bộ sưu tập: Metadata
• ID: 267059
• Chủ đề: 1. 46 instrumentation related to nuclear science and technology; 2. Cross-correlation distribution; 3. Ej-299-33 plastic scintillator; 4. Mcnp; 5. Mcnpx-polimi

Tóm tắt

 New organic?plastic scintillation compositions have demonstrated pulse-shape discrimination (PSD) of neutrons and gamma rays. We present cross-correlation measurements of <
 sup>
 252<
 /sup>
 Cf and mixed uranium?plutonium oxide (MOX) with the EJ-299-33 plastic scintillator. For comparison, equivalent measurements were performed with an EJ-309 liquid scintillator. Offline, digital PSD was applied to each detector. These measurements show that EJ-299-33 sacrifices a factor of 5 in neutron?neutron efficiency relative to EJ-309, but could still utilize the difference in neutron?neutron efficiency and neutron single-to-double ratio to distinguish <
 sup>
 252<
 /sup>
 Cf from MOX. These measurements were modeled with MCNPX-PoliMi, and MPPost was used to convert the detailed collision history into simulated cross-correlation distributions. MCNPX-PoliMi predicted the measured <
 sup>
 252<
 /sup>
 Cf cross-correlation distribution for EJ-309 to within 10%. Greater photon uncertainty in the MOX sample led to larger discrepancy in the simulated MOX cross-correlation distribution. In conclusion, the modeled EJ-299-33 plastic also gives reasonable agreement with measured cross-correlation distributions, although the MCNPX-PoliMi model appears to under-predict the neutron detection efficiency.