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Title: DEVELOPMENT, IMPLEMENTATION AND PERFORMANCE OF A NAI SCINTILLATOR SYSTEM AND MODEL FOR THE DETECTION OF 137CS IN WILDLIFE

Authors:
;
Publication Date:
Research Org.:
SRS
Sponsoring Org.:
USDOE
OSTI Identifier:
1419840
Report Number(s):
SRNL-STI-2017-00293
DOE Contract Number:
DE-AC09-08SR22470
Resource Type:
Conference
Resource Relation:
Conference: IEEE - Nuclear Science Symposium ATLANTA, GA 21-28 OCTOBER, 2017
Country of Publication:
United States
Language:
English

Citation Formats

Brand, A., and Aucott, T.. DEVELOPMENT, IMPLEMENTATION AND PERFORMANCE OF A NAI SCINTILLATOR SYSTEM AND MODEL FOR THE DETECTION OF 137CS IN WILDLIFE. United States: N. p., 2017. Web.
Brand, A., & Aucott, T.. DEVELOPMENT, IMPLEMENTATION AND PERFORMANCE OF A NAI SCINTILLATOR SYSTEM AND MODEL FOR THE DETECTION OF 137CS IN WILDLIFE. United States.
Brand, A., and Aucott, T.. Fri . "DEVELOPMENT, IMPLEMENTATION AND PERFORMANCE OF A NAI SCINTILLATOR SYSTEM AND MODEL FOR THE DETECTION OF 137CS IN WILDLIFE". United States. doi:. https://www.osti.gov/servlets/purl/1419840.
@article{osti_1419840,
title = {DEVELOPMENT, IMPLEMENTATION AND PERFORMANCE OF A NAI SCINTILLATOR SYSTEM AND MODEL FOR THE DETECTION OF 137CS IN WILDLIFE},
author = {Brand, A. and Aucott, T.},
abstractNote = {},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri May 05 00:00:00 EDT 2017},
month = {Fri May 05 00:00:00 EDT 2017}
}

Conference:
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  • The performance characteristics of four compact, room-temperature detectors – two scintillators and two semiconductor detectors – have been studied. All are commercially-available detectors. The two scintillators were a Æ13mmX13mm lanthanum chloride [LaCl3(Ce)] detector and a Æ25mmX25mm sodium iodide [NaI(Tl)] detector. The two semiconductor detectors were a 10X10X3 mm3 cadmium zinc telluride (CZT) detector with a coplanar gridded anode and a 5X5X5 mm3 CZT detector with an extended cathode. The efficiency, resolution, and peak shape performance of these devices are compared in this work. Since LaCl3(Ce) is a relatively new commercial scintillator material, additional information on the performance of this detectormore » is presented. Specifically, we discuss the impact of naturally-occurring radioactive 138La on the background spectra measured with this scintillator. Additionally, two of the three LaCl3(Ce) crystals that we obtained commercially were internally contaminated with an alpha particle-emitting radionuclide which we have identified as 227Ac+daughters. This contamination had a profound impact on the usefulness of these two detectors.« less
  • The utilization of NaI(Tl) scintillators as a high efficiency, fast neutron monitor, through the reaction /sup 127/I(n,n')/sup 127/I/sup 4/(E/sub x/ = 57 keV)/sup 127/I(E/sub x/ = 0), has been established. The total gamma ray production cross sections for the 57 keV gamma ray in /sup 127/I by inelastic scattering of 3 MeV and 14 MeV neutrons are 0.43 +- 0.04 b and 0.28 +- 0.03 b respectively. Temperature and count rate limitations on this utilization have been determined. The same reaction should allow HgI/sub 2/ semiconductor gamma ray detectors with intrinsic energy resolution potentially far superior to NaI(Tl) to bemore » utilized to monitor fast neutrons.« less
  • This paper describes a model-based, feedforward control scheme that can detect faults in the controlled process and improve control performance over traditional PID control. The tool uses static simulation models of the system under control to generate feed-forward control action, which acts as a reference of correct operation. Faults that occur in the system cause discrepancies between the feedforward models and the controlled process. The scheme facilitates detection of faults by monitoring the level of these discrepancies. We present results from the first phase of tests on a dual-duct air-handling unit installed in a large office building in San Francisco.more » We demonstrate the ability of the tool to detect a number of preexisting faults in the system and discuss practical issues related to implementation.« less
  • A Radiation Portal Monitor (RPM) was developed by the Istituto Nazionale di Fisica Nucleare (INFN) and Ansaldo Nucleare (ANN) within the FP7 SCINTILLA European project. The system was designed to detect both gamma and neutron radiation with a single technology. It is conceived to monitor vehicle and cargo containers in transits across borders or ports, to find radioactive elements and to avoid illegal trafficking of strategic nuclear materials. The system is based on a {sup 3}He-free neutron detection technology using plastic scintillators coupled to Gadolinium to detect and discriminate gamma from neutron signals. During the 3 years of the SCINTILLAmore » project the construction and test of the first two prototypes drove the definition of the final layout of a full RPM system consisting of two twin pillars as a portal for vehicle and cargo container scan. A custom System Control Software (SCS) manages the electronics of the RPM, the ancillary devices and the data analysis. The combination of the detector layout and of the software functionalities enables both to distinguish neutrons and gammas and to identify the energy range of a detected gamma source. The system was initially characterized via static tests with gamma and neutron sources in the INFN laboratory. These measurements were used to calibrate the detector, evaluate the response of the single pillars as well as of the full system, and optimize the RPM configuration and discrimination algorithm. During this phase, specific tests were performed to study the stability over time of the system, monitoring the measured the neutron and gamma count rates over periods of several weeks. The results allow us to demonstrate the reliability and robustness of the RPM. In a second time the RPM performance was studied via dynamic tests performed during the SCINTILLA test and benchmark campaigns. These measurements took place in the JRC ITRAP+10 facility at Ispra (Varese-Italy). The laboratory is equipped with an experimental set-up for dynamic tests of multiple systems according to international standards. The performed measurements utilized radioactive sources with activities selected according to ANSI and IEC standards to test the detector alarm performances in terms of gamma and neutron response, sensitivity to high gamma fields, sensitivity to moderated neutron sources as well as false alarm rates (FAR). In addition, the RPM was tested in challenging configurations exceeding the requirements set by international standards to determine the real limits of the system. The results obtained during these campaigns demonstrated that the system detection efficiency is not only compliant to international standards for its category, but often exceeds them, demonstrating the validity of the chosen technology and of the implemented layout. The positive performance also showed the effectiveness of the SCS and of its functionalities. To further demonstrate the system capabilities, a test in a real-life environment of the RPM is planned to happen in a near future by installing the detectors in a seaport. In this presentation I will give an overview of the RPM characteristics, of its performances as determined in the test campaign mentioned above and of future plans, to demonstrate how this technology can be an effective choice for the realization of {sup 3}He-free RPM detectors. (authors)« less
  • INFN and ANN designed and developed a Radiation Portal Monitor (RPM) to detect gamma and neutron radiations using plastic scintillator coupled to Gadolinium. The system is a portal for the screening of vehicle and cargo containers aiming at detecting the presence of radioactive elements and, in particular, Special Nuclear Materials (SNM). The system was calibrated based on static measurements at the INFN laboratory and characterized with dynamic tests at the the JRC ITRAP+10 facility. Results showed that the system is not only compliant to international standards of its category, but exceeds them in most of the cases, demonstrating the validitymore » of the novel technology and of the implemented layout. (authors)« less