scholarly journals Analysis of Compton continuum measurements

1970 ◽  
Author(s):  
R. Gold ◽  
I. K. Olson
Keyword(s):  
Compton Continuum

Airborne gamma‐ray spectrometric background estimation using full spectrum analysis

Geophysics ◽  
1992 ◽  
Vol 57 (2) ◽  
pp. 279-287 ◽  
Author(s):  
B. R. S. Minty
Keyword(s):  
Gamma Ray ◽  
Atmospheric Radiation ◽  
Compton Continuum ◽  
Full Spectrum ◽  
Background Estimation ◽  
Potassium Sources ◽  
Energy Formula ◽  
A New Technique ◽  
The Vertical Distribution ◽  
Atmospheric Radon

We have developed a new technique for estimating airborne gamma‐ray spectrometric backgrounds. The background comes from three sources, namely aircraft, cosmic and atmospheric (radon) radiation. The aircraft and cosmic components are independently estimated by suitable calibration and the monitoring of a 3–6 MeV “cosmic” channel. Multichannel observations of the spectra are used to estimate the atmospheric background directly based on the observation that for gamma‐ray counts above the Compton continuum, the low energy [Formula: see text] photopeak at 0.609 MeV for atmospheric radiation suffers far less attenuation relative to the [Formula: see text] peak at 1.76 MeV than is the case for radiation from uranium in the ground. Since thorium and potassium sources do not contribute appreciably to these peak countrates, they can be used to calculate the contributions of radon and uranium to the observed spectrum. The technique appears to be less susceptible to errors due to the effects of variations in the vertical distribution of airborne radon and its daughters than upward‐looking detector techniques.

Validation of aGeant4model of the X-ray fluorescence microprobe at the Australian Synchrotron

2015 ◽  
Vol 22 (2) ◽  
pp. 354-365 ◽  
Author(s):  
Matthew Richard Dimmock ◽  
Martin Daly de Jonge ◽  
Daryl Lloyd Howard ◽  
Simon Alexander James ◽  
Robin Kirkham ◽  
...  
Keyword(s):  
Experimental Validation ◽  
Low Energy ◽  
Beam Model ◽  
Compton Continuum ◽  
Reconstruction Algorithms ◽  
X Ray ◽  
Simulation Process ◽  
Beryllium Window ◽  
Spectral Distributions ◽  
Energy Physics

AGeant4Monte Carlo simulation of the X-ray fluorescence microprobe (XFM) end-station at the Australian Synchrotron has been developed. The simulation is required for optimization of the scan configuration and reconstruction algorithms. As part of the simulation process, a Gaussian beam model was developed. Experimental validation of this simulation has tested the efficacy for use of the low-energy physics models inGeant4for this synchrotron-based technique. The observed spectral distributions calculated in the 384 pixel Maia detector, positioned in the standard back-scatter configuration, were compared with those obtained from experiments performed at three incident X-ray beam energies: 18.5, 11.0 and 6.8 keV. The reduced χ-squared (\chi^{2}_{\rm{red}}) was calculated for the scatter and fluorescence regions of the spectra and demonstrates that the simulations successfully reproduce the scatter distributions. Discrepancies were shown to occur in the multiple-scatter tail of the Compton continuum. The model was shown to be particularly sensitive to the impurities present in the beryllium window of the Maia detector and their concentrations were optimized to improve the \chi^{2}_{\rm{red}} parameterization in the low-energy fluorescence regions of the spectra.

The Compton continuum: Nuisance or new information in NAA?

2008 ◽  
Vol 278 (3) ◽  
pp. 727-732 ◽  
Author(s):  
P. Bode ◽  
M. I. M. S. Bueno ◽  
K. Goraieb ◽  
M. J. J. Koster-Ammerlaan
Keyword(s):  
Compton Continuum ◽  
New Information

Scintillation and Luminescence Properties of the Zinc Oxide (ZnO) Doped Frit Crystal Under Gamma Radiation

2020 ◽  
Vol 15 (5) ◽  
pp. 566-573
Author(s):  
Osama Khodrog ◽  
Norlaili Kabir ◽  
Xue Gong ◽  
Qinghai Yuan ◽  
Jianhua Liu
Keyword(s):  
Zinc Oxide ◽  
Gamma Radiation ◽  
Luminescent Properties ◽  
Gamma Spectrum ◽  
Luminescence Properties ◽  
Experimental Setup ◽  
Compton Continuum ◽  
Crystal Forms ◽  
Set Up ◽  
Photon Interactions

The main objective of this study is to determine the characteristics of the scintillation and luminescent for Zinc Oxide (ZnO). Two groups of ZnO were prepared: pure (P338) and doped (P338Frit). This study investigates the scintillation and luminescent properties of the prepared ZnO in both powder and crystal forms. The NaI(Tl) scintillator is used as a tool for the control scintillator. It is a crystal that is commercially utilized in many radiation detecting fields. The P338 and P338Frit were used as the scintillator in the experimental setup. The P338 and P338Frit were bombarded with gamma photons of 241Am and 137Cs. The set up was connected to Multichannel Analyzer (MCA) to analyse its gamma spectrum. The scintillation occurrence is followed by the occurrence of luminescence in order for photon interactions to be detected by the MCA system. The photons detected are called count. However, self-absorption of the light is common which prevail the count from being recorded even though the scintillation occurs. The Compton continuum and photoelectric peak of the interaction were not distinguished. In conclusion, the characteristics of the luminescence and scintillation for the prepared ZnO were observed, however, the gamma spectrum peaks recorded were inconclusive.

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