Fast neutron inspection of sea containers for the presence of “dirty bomb”
- 作者：V. Valković ; D. Sudac ; S. Blagus ; K. Nađ ; J. Obhođ ; aš ; B. Vekić ; G. Nebbia ; S. Pesente
- 关键词：Dirty bomb ; Fast neutron inspection ; Time-of-flight measurement
- 刊名：Nuclear Instruments and Methods in Physics Research Section B ; Beam Interactions with Materials and Atoms
- 出版年：2007
- 期刊代码：42_0168583x
- 类别：ph
- 出版时间：October 2007
- 卷：263
- 期：1
- 页码：119-122
- 文件大小：273 K
摘要
The possibility of the detection of “dirty bomb” presence inside sea containers is evaluated. The method proposed for explosive and fissile material detection makes use of two sensors (X-rays and neutrons). A commercial imaging device based on the X-ray radiography performs a fast scan of the container, identifies a “suspect” region and provides its coordinates to the neutron based device for the final “confirmatory” inspection. In this two sensor system a 14 MeV neutron beam defined by the detection of associated alpha particles is used for interrogation of only volume elements marked by X-ray sensor. The object’s nature is determined from passive and neutron induced, gamma energy spectra measurements. Experimental results (time-of-flight and gamma energy spectra) obtained for the irradiation 30 kg of TNT, depleted uranium and other materials hidden inside the container are presented.