Imaging of fast neutrons and gamma rays from ²⁵²Cf in a heavily shielded environment

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• 作者：Jonathan S. Beaumont^a ; ^{j.beaumont@lancaster.ac.uk} ; B. Alan Shippen^b ; Matthew P. Mellor^b ; Malcolm J. Joyce^a
• 关键词：Neutron imaging ; Gamma ray imaging ; MCNP5
• 刊名：Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
• 出版年：2017
• 出版时间：1 March 2017
• 年：2017
• 卷：847
• 期：Complete
• 页码：77-85
• 全文大小：1499 K
• 卷排序：847

文摘

A 75 MBq 252Cf neutron source stored inside a steel water tank was characterised using a compact fast-neutron and gamma-ray imaging system based on a passive slot modulation imaging technique. Radiation fields were imaged from a variety of positions with the source in the stored position (located in the center of the water tank: high shielding) and in the exposed position (located at the edge of the water tank: low shielding). It was possible to locate the 252Cf source in each image and gain additional information of the neutron and gamma-ray fields in the local environment including scatter contributions from the steel shield, floor and walls in proximity to the source. A long exposure image of the stored source, taken over thirty days, identified the location of the radiation source from the low dose (<1μSv/h) field penetrating through 46 cm of water in the storage tank.