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Title: Atomic Beam Laser Spectrometer for In-field Isotopic Analysis

Abstract

This is a powerpoint presentation for the DTRA quarterly program review that goes into detail about the atomic beam laser spectrometer for in-field isotopic analysis. The project goals are the following: analysis of post-detonation debris, determination of U and Pu isotopic composition, and fieldable prototype: < 2ft 3, < 1000W.

Authors:
 [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Actinide Analytical Chemistry Group
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
Defense Threat Reduction Agency (DTRA)
OSTI Identifier:
1258346
Report Number(s):
LA-UR-16-24170
TRN: US1601505
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; ATOMIC BEAMS; SPECTROMETERS; LASERS; ISOTOPE RATIO; NUCLEAR EXPLOSIONS; URANIUM ISOTOPES; PLUTONIUM ISOTOPES

Citation Formats

Castro, Alonso. Atomic Beam Laser Spectrometer for In-field Isotopic Analysis. United States: N. p., 2016. Web. doi:10.2172/1258346.
Castro, Alonso. Atomic Beam Laser Spectrometer for In-field Isotopic Analysis. United States. doi:10.2172/1258346.
Castro, Alonso. 2016. "Atomic Beam Laser Spectrometer for In-field Isotopic Analysis". United States. doi:10.2172/1258346. https://www.osti.gov/servlets/purl/1258346.
@article{osti_1258346,
title = {Atomic Beam Laser Spectrometer for In-field Isotopic Analysis},
author = {Castro, Alonso},
abstractNote = {This is a powerpoint presentation for the DTRA quarterly program review that goes into detail about the atomic beam laser spectrometer for in-field isotopic analysis. The project goals are the following: analysis of post-detonation debris, determination of U and Pu isotopic composition, and fieldable prototype: < 2ft3, < 1000W.},
doi = {10.2172/1258346},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2016,
month = 6
}

Technical Report:

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  • The atmospheric abundances of carbon dioxide and methane have increased dramatically during the industrial era. Measurements of the isotopic composition of these gases can provide a powerful tool for quantifying their sources and sinks. This report describes the development of a portable instrument for isotopic analysis CO{sub 2} and CH{sub 4} using tunable infrared laser absorption spectroscopy. This instrument combines novel optical design and signal processing methods with a widely tunable mid-infrared laser source based on difference frequency generation (DFG) which will can access spectral regions for all the isotopes of CO{sub 2} and CH{sub 4} with a single instrument.more » The instrument design compensates for the large difference in concentration between major and minor isotopes by measuring them with path lengths which differ by a factor of 100 within the same multipass cell. During Phase I we demonstrated the basic optical design and signal processing by determining {sup 13}CO{sub 2} isotopic ratios with precisions as small as 0.2{per_thousand} using a conventional lead salt diode laser. During Phase II, the DFG laser source was coupled with the optical instrument and was demonstrated to detect {sup 13}CH{sub 4}/{sup 12}CH{sub 4} ratios with a precision of 0.5{per_thousand} and an averaging time of 20 s using concentrated methane in air with a mixing ratio of 2700 ppm. Methods for concentrating ambient air for isotopic analysis using this technique have been evaluated. Extensions of this instrument to other species such as {sup 13}CO{sub 2}, C{sup 18}OO, and CH{sub 3}D are possible by substituting lasers at other wavelengths in the DFG source module. The immediate commercial application of this instrument will be to compete with existing mass spectrometric isotope instruments which are expensive, large and relatively slow. The novel infrared source developed in this project can be applied to the measurement of many other gas species and will have wide application in atmospheric monitoring, industrial process control, and medical research and diagnostic development.« less