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Title: Revised SNAP III Training Manual

Abstract

The Shielded Neutron Assay Probe (SNAP) technique was developed to determine the leakage neutron source strength of a radioactive object. The original system consisted of an Eberline TM Mini-scaler and discrete neutron detector. The system was operated by obtaining the count rate with the Eberline TM instrument, determining the absolute efficiency from a graph, and calculating the neutron source strength by hand. In 2003 the SNAP III, shown in Figure 1, was designed and built. It required the operator to position the SNAP, and then measure the source-to-detector and detectorto- reflector distances. Next the operator entered the distance measurements and started the data acquisition. The SNAP acquired the required count rate and then calculated and displayed the leakage neutron source strength (NSS). The original design of the SNAP III is described in SNAP III Training Manual (ER-TRN-PLN-0258, Rev. 0, January 2004, prepared by William Baird) This report describes some changes that have been made to the SNAP III. One important change is the addition of a LEMO connector to provide neutron detection output pulses for input to the MC-15. This feature is useful in active interrogation with a neutron generator because the MC-15 has the capability to only record datamore » when it is not gated off by a pulse from the neutron generator. This avoids recording of a lot of data during the generator pulses that are not useful. Another change was the replacement of the infrared RS-232 serial communication output by a similar output via a 4-pin LEMO connector. The current document includes a more complete explanation of how to estimate the amount of moderation around a neutron-emitting source.« less

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1409806
Report Number(s):
LA-UR-17-30627
DOE Contract Number:  
AC52-06NA25396
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY

Citation Formats

Moss, Calvin Elroy, Gonzales, Samuel M., Myers, William L., Nelson, Mark Andrew, Rothrock, Richard Brian, Salazar, Samuel A., Sorensen, Eric Byron, and Sundby, Gary M. Revised SNAP III Training Manual. United States: N. p., 2017. Web. doi:10.2172/1409806.
Moss, Calvin Elroy, Gonzales, Samuel M., Myers, William L., Nelson, Mark Andrew, Rothrock, Richard Brian, Salazar, Samuel A., Sorensen, Eric Byron, & Sundby, Gary M. Revised SNAP III Training Manual. United States. doi:10.2172/1409806.
Moss, Calvin Elroy, Gonzales, Samuel M., Myers, William L., Nelson, Mark Andrew, Rothrock, Richard Brian, Salazar, Samuel A., Sorensen, Eric Byron, and Sundby, Gary M. Tue . "Revised SNAP III Training Manual". United States. doi:10.2172/1409806. https://www.osti.gov/servlets/purl/1409806.
@article{osti_1409806,
title = {Revised SNAP III Training Manual},
author = {Moss, Calvin Elroy and Gonzales, Samuel M. and Myers, William L. and Nelson, Mark Andrew and Rothrock, Richard Brian and Salazar, Samuel A. and Sorensen, Eric Byron and Sundby, Gary M.},
abstractNote = {The Shielded Neutron Assay Probe (SNAP) technique was developed to determine the leakage neutron source strength of a radioactive object. The original system consisted of an EberlineTM Mini-scaler and discrete neutron detector. The system was operated by obtaining the count rate with the EberlineTM instrument, determining the absolute efficiency from a graph, and calculating the neutron source strength by hand. In 2003 the SNAP III, shown in Figure 1, was designed and built. It required the operator to position the SNAP, and then measure the source-to-detector and detectorto- reflector distances. Next the operator entered the distance measurements and started the data acquisition. The SNAP acquired the required count rate and then calculated and displayed the leakage neutron source strength (NSS). The original design of the SNAP III is described in SNAP III Training Manual (ER-TRN-PLN-0258, Rev. 0, January 2004, prepared by William Baird) This report describes some changes that have been made to the SNAP III. One important change is the addition of a LEMO connector to provide neutron detection output pulses for input to the MC-15. This feature is useful in active interrogation with a neutron generator because the MC-15 has the capability to only record data when it is not gated off by a pulse from the neutron generator. This avoids recording of a lot of data during the generator pulses that are not useful. Another change was the replacement of the infrared RS-232 serial communication output by a similar output via a 4-pin LEMO connector. The current document includes a more complete explanation of how to estimate the amount of moderation around a neutron-emitting source.},
doi = {10.2172/1409806},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Nov 21 00:00:00 EST 2017},
month = {Tue Nov 21 00:00:00 EST 2017}
}

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