Long Range, Passive Detection of Fissile Materials

Fabris, L ; Ziock, K P

Lawrence Livermore National Laboratory

关键词: 46 Instrumentation Related To Nuclear Science And Technology;    71 Classical And Quantum Mechanics, General Physics;    Apertures;    Fissile Materials;    11 Nuclear Fuel Cycle And Fuel Materials;   

DOI  :  10.2172/15014647
RP-ID  :  UCRL-TR-209639
RP-ID  :  W-7405-ENG-48
RP-ID  :  15014647

美国|英语

来源: UNT Digital Library

【 摘 要 】

We have recently completed a large-area, coded-aperture, gamma-ray imager for use in searching for radiation sources. The instrument was constructed to verify that weak point sources can be detected at considerable distances if one uses imaging to overcome fluctuations in the natural background. The instrument uses a rank-19, one-dimensional coded aperture to cast shadow patterns onto a 0.57 m{sup 2} NaI(Tl) detector composed of 57 individual cubes each 10 cm on a side. These are arranged in a 19 x 3 array. The mask is composed of four-centimeter thick, one-meter high, 10-cm wide lead blocks. The instrument is mounted in the back of a small truck from which images are obtained as one drives through a region.