Spectral characterization of flash and high flux x-ray radiographic sources with a magnetic Compton spectrometer

Espy, Michelle A.; Klasky, Marc Louis; James, Michael R.; Moir, David C.; Mendez, Albert Jacob; Morneau, Rachel Anne; Shurter, Roger P.; Sedillo, Robert; Volegov, Petr Lvovich; Gehring, Amanda Elizabeth

doi:10.1063/5.0053184

Title: Spectral characterization of flash and high flux x-ray radiographic sources with a magnetic Compton spectrometer

Journal Article · 12 August 2021 · Review of Scientific Instruments

DOI: https://doi.org/10.1063/5.0053184 · OSTI ID:1841910

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^[1]; James, Michael R. ^[1];

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^[1]; Morneau, Rachel Anne ^[1];

^[1]; Sedillo, Robert ^[1];

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Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

In this article, we present a new analysis method applied to revitalize permanent magnet Compton spectrometers used to measure photon energy spectra in the MeV range. The inversion of the measured electron distribution to determine the original photon distribution is achieved via a method of consistent coupled radiation transport and magnetic field mapping of the input photon spectra to the measured electron distribution. The method of linear least squares was used to perform the unfolding of the electron distribution to the initial photon spectra, without any assumptions made regarding the electron distribution. We present an application of this method to data from a nominal 19.4 MeV flash radiographic source (the first axis of the Dual Axis Radiographic Hydro-Test Facility) capable of generating 500 R @ 1 m in ~60 ns and a medical therapy source (a Scanditronix M22, Microtron) capable of variable energies with nominal endpoints of 6, 10, 15, and 20 MeV and an output of ~1000–2000 R/min @ 1 m. The results provide agreement between the modeled and unfolded experimentally measured photon spectra as quantified by statistical tests, from 1.5 to 20 MeV. Experimental results are presented as well as a discussion of the novel MCNP6-based simulations and methods for reconstruction of the spectra.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: 89233218CNA000001

OSTI ID:: 1841910

Report Number(s):: LA-UR-19-31225

Journal Information:: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 8 Vol. 92; ISSN 0034-6748

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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