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Title: Fast neutron background characterization with the Radiological Multi-sensor Analysis Platform (RadMAP)

Abstract

In an effort to characterize the fast neutron radiation background, 16 EJ-309 liquid scintillator cells were installed in the Radiological Multi-sensor Analysis Platform (RadMAP) to collect data in the San Francisco Bay Area. Each fast neutron event was associated with specific weather metrics (pressure, temperature, absolute humidity) and GPS coordinates. The expected exponential dependence of the fast neutron count rate on atmospheric pressure was demonstrated and event rates were subsequently adjusted given the measured pressure at the time of detection. Pressure adjusted data was also used to investigate the influence of other environmental conditions on the neutron background rate. Using National Oceanic and Atmospheric Administration (NOAA) coastal area lidar data, an algorithm was implemented to approximate sky-view factors (the total fraction of visible sky) for points along RadMAPs route. Three areas analyzed in San Francisco, Downtown Oakland, and Berkeley all demonstrated a suppression in the background rate of over 50% for the range of sky-view factors measured. This effect, which is due to the shielding of cosmic-ray produced neutrons by surrounding buildings, was comparable to the pressure influence which yielded a 32% suppression in the count rate over the range of pressures measured.

Authors:
 [1];  [2];  [3]
  1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); United States Military Academy, West Point, NY (United States)
  2. Sandia National Lab. (SNL-CA), Livermore, CA (United States)
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA), Office of Defense Nuclear Nonproliferation
OSTI Identifier:
1356840
Alternate Identifier(s):
OSTI ID: 1458500
Report Number(s):
SAND2017-4060J
Journal ID: ISSN 0168-9002; PII: S0168900217303820; TRN: US1702504
Grant/Contract Number:  
AC04-94AL85000; AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment
Additional Journal Information:
Journal Volume: 858; Journal Issue: C; Journal ID: ISSN 0168-9002
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; Fast neutron detection; Liquid scintillator; Background radiation; Radiation detection; Mobile detection system

Citation Formats

Davis, John R., Brubaker, Erik, and Vetter, Kai. Fast neutron background characterization with the Radiological Multi-sensor Analysis Platform (RadMAP). United States: N. p., 2017. Web. doi:10.1016/j.nima.2017.03.042.
Davis, John R., Brubaker, Erik, & Vetter, Kai. Fast neutron background characterization with the Radiological Multi-sensor Analysis Platform (RadMAP). United States. https://doi.org/10.1016/j.nima.2017.03.042
Davis, John R., Brubaker, Erik, and Vetter, Kai. Wed . "Fast neutron background characterization with the Radiological Multi-sensor Analysis Platform (RadMAP)". United States. https://doi.org/10.1016/j.nima.2017.03.042. https://www.osti.gov/servlets/purl/1356840.
@article{osti_1356840,
title = {Fast neutron background characterization with the Radiological Multi-sensor Analysis Platform (RadMAP)},
author = {Davis, John R. and Brubaker, Erik and Vetter, Kai},
abstractNote = {In an effort to characterize the fast neutron radiation background, 16 EJ-309 liquid scintillator cells were installed in the Radiological Multi-sensor Analysis Platform (RadMAP) to collect data in the San Francisco Bay Area. Each fast neutron event was associated with specific weather metrics (pressure, temperature, absolute humidity) and GPS coordinates. The expected exponential dependence of the fast neutron count rate on atmospheric pressure was demonstrated and event rates were subsequently adjusted given the measured pressure at the time of detection. Pressure adjusted data was also used to investigate the influence of other environmental conditions on the neutron background rate. Using National Oceanic and Atmospheric Administration (NOAA) coastal area lidar data, an algorithm was implemented to approximate sky-view factors (the total fraction of visible sky) for points along RadMAPs route. Three areas analyzed in San Francisco, Downtown Oakland, and Berkeley all demonstrated a suppression in the background rate of over 50% for the range of sky-view factors measured. This effect, which is due to the shielding of cosmic-ray produced neutrons by surrounding buildings, was comparable to the pressure influence which yielded a 32% suppression in the count rate over the range of pressures measured.},
doi = {10.1016/j.nima.2017.03.042},
journal = {Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment},
number = C,
volume = 858,
place = {United States},
year = {2017},
month = {3}
}

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