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Title: System and plastic scintillator for discrimination of thermal neutron, fast neutron, and gamma radiation

Abstract

A scintillator material according to one embodiment includes a polymer matrix; a primary dye in the polymer matrix, the primary dye being a fluorescent dye, the primary dye being present in an amount of 3 wt % or more; and at least one component in the polymer matrix, the component being selected from a group consisting of B, Li, Gd, a B-containing compound, a Li-containing compound and a Gd-containing compound, wherein the scintillator material exhibits an optical response signature for thermal neutrons that is different than an optical response signature for fast neutrons and gamma rays. A system according to one embodiment includes a scintillator material as disclosed herein and a photodetector for detecting the response of the material to fast neutron, thermal neutron and gamma ray irradiation.

Inventors:
; ; ; ; ; ;
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1357547
Patent Number(s):
9,650,564
Application Number:
13/471,259
Assignee:
Lawrence Livermore National Security, LLC LLNL
DOE Contract Number:
AC52-07NA27344
Resource Type:
Patent
Resource Relation:
Patent File Date: 2012 May 14
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY

Citation Formats

Zaitseva, Natalia P., Carman, M. Leslie, Faust, Michelle A., Glenn, Andrew M., Martinez, H. Paul, Pawelczak, Iwona A., and Payne, Stephen A. System and plastic scintillator for discrimination of thermal neutron, fast neutron, and gamma radiation. United States: N. p., 2017. Web.
Zaitseva, Natalia P., Carman, M. Leslie, Faust, Michelle A., Glenn, Andrew M., Martinez, H. Paul, Pawelczak, Iwona A., & Payne, Stephen A. System and plastic scintillator for discrimination of thermal neutron, fast neutron, and gamma radiation. United States.
Zaitseva, Natalia P., Carman, M. Leslie, Faust, Michelle A., Glenn, Andrew M., Martinez, H. Paul, Pawelczak, Iwona A., and Payne, Stephen A. Tue . "System and plastic scintillator for discrimination of thermal neutron, fast neutron, and gamma radiation". United States. doi:. https://www.osti.gov/servlets/purl/1357547.
@article{osti_1357547,
title = {System and plastic scintillator for discrimination of thermal neutron, fast neutron, and gamma radiation},
author = {Zaitseva, Natalia P. and Carman, M. Leslie and Faust, Michelle A. and Glenn, Andrew M. and Martinez, H. Paul and Pawelczak, Iwona A. and Payne, Stephen A.},
abstractNote = {A scintillator material according to one embodiment includes a polymer matrix; a primary dye in the polymer matrix, the primary dye being a fluorescent dye, the primary dye being present in an amount of 3 wt % or more; and at least one component in the polymer matrix, the component being selected from a group consisting of B, Li, Gd, a B-containing compound, a Li-containing compound and a Gd-containing compound, wherein the scintillator material exhibits an optical response signature for thermal neutrons that is different than an optical response signature for fast neutrons and gamma rays. A system according to one embodiment includes a scintillator material as disclosed herein and a photodetector for detecting the response of the material to fast neutron, thermal neutron and gamma ray irradiation.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue May 16 00:00:00 EDT 2017},
month = {Tue May 16 00:00:00 EDT 2017}
}

Patent:

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  • In one embodiment, a scintillator material includes a polymer matrix; and a primary dye in the polymer matrix, the primary dye being a fluorescent dye, the primary dye being present in an amount of 5 wt % or more; wherein the scintillator material exhibits an optical response signature for neutrons that is different than an optical response signature for gamma rays. In another embodiment, a scintillator material includes a polymer matrix; and a primary dye in the polymer matrix, the primary dye being a fluorescent dye, the primary dye being present in an amount greater than 10 wt %.
  • Methods for manufacturing solid-state thermal neutron detectors with simultaneous high thermal neutron detection efficiency (>50%) and neutron to gamma discrimination (>10.sup.4) are provided. A structure is provided that includes a p+ region on a first side of an intrinsic region and an n+ region on a second side of the intrinsic region. The thickness of the intrinsic region is minimized to achieve a desired gamma discrimination factor of at least 1.0E+04. Material is removed from one of the p+ region or the n+ region and into the intrinsic layer to produce pillars with open space between each pillar. The openmore » space is filed with a neutron sensitive material. An electrode is placed in contact with the pillars and another electrode is placed in contact with the side that is opposite of the intrinsic layer with respect to the first electrode.« less
  • The goal of this thesis was to construct and test a neutron detector to measure the energy spectrum of 1 to 14-MeV neutrons in the presence of gammas. A spectrometer based on the process of pulse shape discrimination (PSD) was constructed, in which the scintillator NE-213 was used. The primary neutron/gamma sources used were 78-mCi and 4.7-Ci (239)PuBe sources, while 4.7-micro-Ci and 97.6-micro-Ci (22)Na gamma sources were used for energy calibration and additional testing of the detector. Proton recoil spectra and Compton electron spectra were unfolded with the neutron and gamma unfolding code FORIST to generate the incident neutron andmore » gamma spectra, respectively. FORIST, which was written for a CDC computer, was modified to run on a VAX 6420. The experimental spectra were compared to those in the literature. The locations of the peaks in the (239)PuBe spectrum agreed with the literature to within 8.3%, the (239)PuBe gamma spectrum agreed to within 0.7%, while the (22)Na gamma spectrum agreed exactly. Uncertainties in the detection system and unfolding procedure are on the order of 5-10%. This thesis is intended to be a summary of the relevant literature and a user's guide to the PSD spectrometer.... Neutron unfolding code, Gamma spectrometry, Neutron spectrometry, Pulse shape discrimination.« less
  • In one embodiment, a scintillator includes a scintillator material; a primary fluor, and a Li-containing compound, where the Li-containing compound is soluble in the primary fluor, and where the scintillator exhibits an optical response signature for thermal neutrons that is different than an optical response signature for fast neutrons and gamma rays.
  • A system is disclosed for measuring indications of the thermal neutron lifetime of earth materials in the vicinity of a well borehole. A harmonically intensity modulated source of fast neutrons is used to irradiate the earth formations in the vicinity of a borehole with fast neutrons at three different intensity modulation frequencies. Intensity modulated clouds of thermal neutrons at each of the three modulation frequencies are detected by a single spaced detector. The tangent of phase shift of the thermal neutron intensity with respect to the fast neutron population intensity is measured at each of the three frequencies. These measurementsmore » may be appropriately combined to derive the thermal neutron lifetime of earth materials in the vicinity of the borehole. (auth)« less