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

被引：6

作者：

Espy, M. ^{[1
]}

Klasky, M. ^{[2
]}

James, M. ^{[3
]}

Moir, D. ^{[4
]}

Mendez, J. ^{[5
]}

Morneau, R. ^{[6
]}

Shurter, R. ^{[4
]}

Sedillo, R. ^{[4
]}

Volegov, P. ^{[2
]}

Gehring, A. ^{[2
]}

机构：

[1] Los Alamos Natl Lab, Nondestruct Testing & Evaluat, Los Alamos, NM 87545 USA

[2] Los Alamos Natl Lab, Neutron Sci & Technol, Los Alamos, NM 87545 USA

[3] Los Alamos Natl Lab, Nucl & Radiochem, Los Alamos, NM 87545 USA

[4] Los Alamos Natl Lab, DARHT Phys & Pulsed Power, Los Alamos, NM 87545 USA

[5] Los Alamos Natl Lab, DARHT Expt & Diagnost, Los Alamos, NM 87545 USA

[6] Los Alamos Natl Lab, Detonat Sci & Technol, Los Alamos, NM 87545 USA

来源：

REVIEW OF SCIENTIFIC INSTRUMENTS | 2021年 / 92卷 / 08期

关键词：

GAMMA-RAYS; BREMSSTRAHLUNG; TARGETS;

D O I：

10.1063/5.0053184

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

In this work, 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 similar to 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 similar to 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.

引用

页数：13

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