Paper Publications

Impact Factor:1.4

DOI number:10.1016/j.nima.2011.02.011

Journal:Nuclear Instruments and Methods in Physics Research A

Key Words:Thermal neutron radiography RFQ accelerator Moderator Collimator Imaging system

Abstract:A neutron imaging facility, PKUNIFTY, based on a radio frequency quadrupole (RFQ) accelerator-driven compact neutron source, presently under construction at the Peking University, is described. It consists of a deuteron linear accelerator, a neutron target–moderator–reflector assembly, and a thermal neutron imaging system. Neutrons are generated via the deuteron–beryllium reaction with an expected fast-neutron yield of 3×1012 n/s. The thermal neutron flux on the imaging plane is 5×105 n/cm2/s at a nominal L/D ratio of 50, and the L/D ratio can be selectable over a range of 25–200. The corresponding n/γ ratio is close to or higher than 1×1010 n/cm2/Sv. The field of view is 20 cm×20 cm at 2 m downstream of the collimator entrance aperture where the thermal neutron flux uniformity is better than 7%. The effective Cd ratio can be tuned by using a light chopper and neutron time-of-flight technique without excessive sacrifice of the thermal neutron flux.

Indexed by:Journal paper

Document Type:J

Volume:651

Issue:1

Page Number:62-66

Translation or Not:no

Date of Publication:2011-09-21

Included Journals:SCI

Links to published journals:https://www.sciencedirect.com/science/article/pii/S0168900211002890

First Author:邹宇斌

Correspondence Author:郭之虞

All the Authors:温伟伟,陆元荣,彭士香,朱昆,颜学庆,高淑丽,赵捷,李航,周泉丰,任海涛,张萌,吕鹏南,郭继美,唐国有,貘大卫,陈佳洱