FRUIT:: An operational tool for multisphere neutron spectrometry in workplaces

被引:135
作者
Bedogni, Roberto
Domingo, Carles
Esposito, Adolfo
Fernandez, Francisco
机构
[1] Ist Nazl Fis Nucl, LNF Frascati Natl Lab, I-00044 Frascati, Italy
[2] Univ Autonoma Barcelona, Dept Fis, Grp Fis Radiac, E-08193 Barcelona, Spain
关键词
multisphere; Bonner sphere; neutron spectrometry; unfolding; parametric spectrum modeling;
D O I
10.1016/j.nima.2007.07.033
中图分类号
TH7 [仪器、仪表];
学科分类号
0804 ; 080401 ; 081102 ;
摘要
FRUIT (Frascati Unfolding Interactive Tool) is an unfolding code for Bonner sphere spectrometers (BSS) developed, under the Labview environment, at the INFN-Frascati National Laboratory. It models a generic neutron spectrum as the superposition of up to four components (thermal, epithermal, fast and high energy), fully defined by up to seven positive parameters. Different physical models are available to unfold the sphere counts, covering the majority of the neutron spectra encountered in workplaces. The iterative algorithm uses Monte Carlo methods to vary the parameters and derive the final spectrum as limit of a succession of spectra fulfilling the established convergence criteria. Uncertainties on the final results are evaluated taking into consideration the different sources of uncertainty affecting the input data. Relevant features of FRUIT are (1) a high level of interactivity, allowing the user to follow the convergence process, (2) the possibility to modify the convergence tolerances during the run, allowing a rapid achievement of meaningful solutions and (3) the reduced dependence of the results from the initial hypothesis. This provides a useful instrument for spectrometric measurements in workplaces, where detailed a priori information is usually unavailable. This paper describes the characteristics of the code and presents the results of performance tests over a significant variety of reference and workplace neutron spectra ranging from thermal up to hundreds MeV neutrons. (C) 2007 Elsevier B.V. All rights reserved.
引用
收藏
页码:1301 / 1309
页数:9
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