Deconvolution of continuous internal bremsstrahlung spectra of 32P, 85Kr and 143Pr

Almaz, Ekrem; Cengiz, Ahmet

doi:10.1002/xrs.1001

Cited by 8 publications

(4 citation statements)

References 24 publications

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“…The response matrix gives the probability that a photon is detected. In order to obtain a response matrix 𝑅(𝐸, 𝐸 0 ) one needs to calculate the Peak-to-Total ratio (P/T) (Rahma and Cho, 2010;Almaz et al, 2007). To obtain the peak-to-total ratio, the mono-energetic gamma spectrum peak was fitted to the Gaussian functions, and the peak region was calculated by taking  96 .…”

Section: Peak To Total Ratiomentioning

confidence: 99%

Comparison of End-Point Energies of Bremsstrahlung Photons from 28- GHz ECR Ion Source in Three Measurement Locations

Kumwenda

2023

TJET

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Bremsstrahlung photons measurement show elevated energy emission beyond critical energy in 28-GHz ECR and its nature is not revealed. Thus, the aim of this study is to unveil the nature of high end-point energies at the three measurement locations. Bremsstrahlung photons from a 28-GHz ECR ion source were measured at Busan center of Korean Basic Science Institute (KBSI). The gamma-ray detection system consists of three round type NaI(Tl) scintillation detectors placed 62 cm radially from the beam axis at the three measurement locations namely injection, centre and extraction sides of an ECR ion source, and a NaI(Tl) scintillation detector placed at the view port for monitoring photon intensity along the beam axis. Such design of the experiment was based on the inner structure of the ECR ion source and the shape of the ECR plasma. Also, bremsstrahlung photons were measured by exchanging the detector positions for studying systematic uncertainties. Monte Carlo simulation based on the Geant4 package was performed to take geometrical acceptance and the energydependent detection efficiency into account due to large non-uniformity in the material budget. True bremsstrahlung energy spectra from the 28-GHz ECR ion source were extracted using an inverse matrix unfolding method. The measured high end-point energies at the three measurement locations were 1.68 MeV, 1.72 MeV and 2.04 MeV for the injection, centre and extraction sides, respectively. The high end-point energy values of the measured bremsstrahlung photons beyond the theoretical energy value of 1.33 MeV were found to be correlated with the structure of the ECR ion source and the shape of the ECR plasma. Furthermore, the high end-point energy values resulting from the bremsstrahlung photons measurements in the 28-GHz ECR plasma are due to the higher number of unconfined electrons arriving at the chamber wall easily, and producing higher bremsstrahlung photons. The unconfined electrons are the results of imperfect magnetic confinement that cause electrons to escape from the plasma volume.

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Section: Peak To Total Ratiomentioning

confidence: 99%

Comparison of End-Point Energies of Bremsstrahlung Photons from 28- GHz ECR Ion Source in Three Measurement Locations

Kumwenda

2023

TJET

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“…The response matrix gives the probability that a photon is detected. In order to obtain response matrix it is important to calculate Peak-to-Total ratio (P/T) (Rahma and Cho, 2010;Almaz and Cengiz, 2007).…”

Section: Simulation Of Response Functionmentioning

confidence: 99%

Deconvolution of Mono-Energetic and Multi-Lines Gamma-Ray Spectra Obtained with NaI(Tl) Scintillation Detectors Using Direct Matrix Inversion Method

Kumwenda

2020

TJET

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Performance of a NaI(Tl) scintillation detector based on the gamma-ray spectroscopy system is not satisfactory in retaining its original peak (which is delta like function) of various gamma ray spectrum. The method of achieving precise peak for the various gamma ray was conducted by converting the observed pulse-height distribution of the NaI(Tl) detector to a true photon spectrum. This method is obtained experimentally with the help of an inverse matrix deconvolution method. The method is based on response matrix generated by the Monte Carlo simulation based on Geant4 package of mono-energy gamma-ray photon ranging from 0.050 to 2.04 MeV in the interval of 10 keV. The comparison of the measured and simulated response function was also performed in order to authenticate the simulation response function. Good agreement was observed around the photo-peak region of the spectrum, but slight deviation was observed at low energy region especially below 0.2 MeV. The Compton backscattering and Compton continuum counts was significantly transferred into the corresponding photo-peak and consequently the peak to total(P/T) ratio was improved. The P/T ratio results obtained after application of the deconvolution method taken with three calibration sources with gamma-ray’s energies of 81 keV, 303 keV and 356 keV (for 133Ba), 662 keV (for 137Cs), 1173 keV and 1333keV (for 60Co), were improved from(to) 0.50(0.90), 0.40(0.83), 0.57(0.93), 0.31(0.92), 0.18(0.84) and 0.15(0.83), respectively.

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“…Hence, the observed spectrum has to be deconvoluted from the detector resolution function to get the original or incident spectrum. [28][29][30][31][32][33][34] The action of the resolution function Res(E, E ) can be characterised by the following integral equation:…”

Section: B Deconvolution Of the Observed Datamentioning

confidence: 99%

“…These methods are summarised in the context of their applicability in spectroscopy by Morhac. 35 In our particular case, a FORTRAN-based implementation of Gold's algorithm 29,30 was used. The FORTRAN program was developed in-house, and was tested by actually taking a simulated spectrum, convoluting it with the resolution function (by actual matrix multiplication) and then deconvoluting it using the FORTRAN program.…”

Section: B Deconvolution Of the Observed Datamentioning

confidence: 99%

Temperature diagnostics of ECR plasma by measurement of electron bremsstrahlung

Kasthurirangan

Agnihotri

Desai

et al. 2012

Review of Scientific Instruments

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The x-ray bremsstrahlung spectrum emitted by the electron population in a 14.5 GHz ECR plasma source has been measured using a NaI(Tl) detector, and hence the electron temperature of the higher energy electron population in the plasma has been determined. The x-ray spectra for Ne and Ar gases have been systematically studied as a function of inlet gas pressure from 7 × 10(-7) mbar to 7 × 10(-5) mbar and for input microwave power ∼1 W to ∼300 W. At the highest input power and optimum pressure conditions, the end point bremsstrahlung energies are seen to reach ∼700 keV. The estimated electron temperatures (T(e)) were found to be in the range 20 keV-80 keV. The T(e) is found to be peaking at a pressure of 1 × 10(-5) mbar for both gases. The T(e) is seen to increase with increasing input power in the intermediate power region, i.e., between 100 and 200 W, but shows different behaviour for different gases in the low and high power regions. Both gases show very weak dependence of electron temperature on inlet gas pressure, but the trends in each gas are different.

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Deconvolution of continuous internal bremsstrahlung spectra of ³²P, ⁸⁵Kr and ¹⁴³Pr

Cited by 8 publications

References 24 publications

Comparison of End-Point Energies of Bremsstrahlung Photons from 28- GHz ECR Ion Source in Three Measurement Locations

Comparison of End-Point Energies of Bremsstrahlung Photons from 28- GHz ECR Ion Source in Three Measurement Locations

Deconvolution of Mono-Energetic and Multi-Lines Gamma-Ray Spectra Obtained with NaI(Tl) Scintillation Detectors Using Direct Matrix Inversion Method

Temperature diagnostics of ECR plasma by measurement of electron bremsstrahlung

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