Development of the Detector Response Function Approach for the Library Least-Squares Analysis of Energy-Dispersive X-Ray Fluorescence Spectra

1978 ◽  
Vol 22 ◽  
pp. 317-323 ◽  
Author(s):  
L. Wielopolski ◽  
R. P. Gardner
Keyword(s):  
Least Squares ◽  
Response Function ◽  
Fluorescence Spectra ◽  
Pulse Height ◽  
Energy Dispersive ◽  
Analytical Models ◽  
Detector Response ◽  
Height Distribution ◽  
Pulse Height Distribution ◽  
X Ray

A procedure to obtain analytical models for the elemental X-ray pulse-height distribution libraries necessary in the library least-squares analysis of energy-dispersive x-ray fluorescence spectra is outlined. This is accomplished by first obtaining the response function of Si(Li) detectors for incident photons in the energy range of interest. Subsequently this response function is used to generate the desired elemental library standards for use in the least-squares analysis of spectra, or it can be used directly within a least-squares computer program, thus eliminating the large amount of computer storage required for the standards.

Evaluation of the Energy Dispersive Detector as a Detector-Filter System for the X-Ray Diffractometer

1972 ◽  
Vol 16 ◽  
pp. 322-335 ◽  
Author(s):  
Davis Carpenter ◽  
John Thatcher
Keyword(s):  
Scintillation Detector ◽  
Pulse Height ◽  
Good Deal ◽  
Energy Dispersive ◽  
Maximum Efficiency ◽  
Height Distribution ◽  
Pulse Height Distribution ◽  
Pulse Height Analyzer ◽  
X Ray ◽  
Detector Pulse

AbstractA comparison of the relative merits of the energy dispersive derector-pulse height analyzer, scintillation detector-graphite monochromator, and proportional detector-pulse height analyzer combinations.Typical energy dispersive detectors are not configured for maximum efficiency on the diffractometer. Being only on the order of 3 mm diameter, a good deal of the available information is not collected by the detector. This is especially true with the Wide optics found in modern diffractometers. The energy dispersive detector incorporated into this system is optimized for the x-ray diffractometer. Its detection area is a 1.25 X 0.25 inch rectangle. The resolution is only sufficient to remove the Kβ portion of the spectrum.Conventional diffractometer techniques incorporate either a scintillation detector-crystal monochromator, or a proportional detector-pulse height analyser combination. The question posed is “what are the advantages in signal to noise ratio and pulse height distribution of the energy dispersive-pulse height analyzer over the more conventional arrangements.”

Energy-dependent dead-time correction in digital pulse processors applied to silicon drift detector's X-ray spectra

2018 ◽  
Vol 25 (2) ◽  
pp. 484-495 ◽  
Author(s):  
Suelen F. Barros ◽  
Vito R. Vanin ◽  
Alexandre A. Malafronte ◽  
Nora L. Maidana ◽  
Marcos N. Martins
Keyword(s):  
Dead Time ◽  
Pulse Height ◽  
Height Distribution ◽  
Pulse Height Distribution ◽  
Dead Time Correction ◽  
Time Model ◽  
X Ray ◽  
Digital Pulse ◽  
Analytical Correction ◽  
Energy Dependent

Dead-time effects in X-ray spectra taken with a digital pulse processor and a silicon drift detector were investigated when the number of events at the low-energy end of the spectrum was more than half of the total, at counting rates up to 56 kHz. It was found that dead-time losses in the spectra are energy dependent and an analytical correction for this effect, which takes into account pulse pile-up, is proposed. This and the usual models have been applied to experimental measurements, evaluating the dead-time fraction either from the calculations or using the value given by the detector acquisition system. The energy-dependent dead-time model proposed fits accurately the experimental energy spectra in the range of counting rates explored in this work. A selection chart of the simplest mathematical model able to correct the pulse-height distribution according to counting rate and energy spectrum characteristics is included.

A Universal Detector for the X-Ray Spectrograph

1958 ◽  
Vol 2 ◽  
pp. 293-301 ◽  
Author(s):  
William R. Kiley
Keyword(s):  
Entire Range ◽  
Pulse Height ◽  
Height Distribution ◽  
Pulse Height Distribution ◽  
X Ray ◽  
Universal Detector ◽  
Detector Arrangement

AbstractA detector arrangement has been developed which will give nearly 100% efficiency over the entire range of wavelengths normally used in X-ray spectroscopy, including radiation from Mg Kα. A description of this counter is given and data obtained on pulse height distribution and pulse amplitudes will be discussed. Results obtained with typical specimens will be shown.

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

2020 ◽  
Vol 39 (2) ◽  
pp. 104-115
Author(s):  
Mwingereza Kumwenda
Keyword(s):  
Response Function ◽  
Gamma Ray ◽  
Pulse Height ◽  
Inversion Method ◽  
Height Distribution ◽  
Deconvolution Method ◽  
Pulse Height Distribution ◽  
Simulation Based ◽  
Energy Gamma ◽  
Matrix Inversion Method

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.

The Resolution of X-Ray Fluorescence Spectra by the Least Squares Method

1978 ◽  
Vol 22 ◽  
pp. 337-342
Author(s):  
Colin G. Sanderson
Keyword(s):  
Least Squares ◽  
Fluorescence Spectra ◽  
Gamma Ray ◽  
Least Squares Method ◽  
Computer Programs ◽  
Energy Dispersive ◽  
X Ray ◽  
Computer Codes

Least squares computer programs have been used for the resolution of complex gamma-ray spectra obtained from NaI(Tl) detectors for many years. With the addition of computer codes, which account for the differences “between gamma-ray and x-ray fluorescence spectra, these same programs can be used to quantify energy dispersive x-ray fluorescence data.

scholarly journals Estimation of I-131 Concentration Using Time History of Pulse Height Distribution at Monitoring Post and Detector Response for Radionuclide in Plume

2014 ◽  
Vol 13 (3) ◽  
pp. 119-126 ◽  
Author(s):  
Hideo HIRAYAMA ◽  
Masatsugu KAWASAKI ◽  
Hiroshi MATSUMURA ◽  
Takehisa OHKURA ◽  
Yoshihito NAMITO ◽  
...  
Keyword(s):  
Pulse Height ◽  
Time History ◽  
Detector Response ◽  
Height Distribution ◽  
Pulse Height Distribution ◽  
History Of

scholarly journals Estimation of I-131 Concentration Using Time History of Pulse Height Distribution at Monitoring Post and Detector Response for Radionuclide in Plume

2021 ◽  
pp. 295-307
Author(s):  
Hideo HIRAYAMA ◽  
Masatsugu KAWASAKI ◽  
Hiroshi MATSUMURA ◽  
Takehisa OHKURA ◽  
Yoshihito NAMITO ◽  
...  
Keyword(s):  
Pulse Height ◽  
Time History ◽  
Detector Response ◽  
Height Distribution ◽  
Pulse Height Distribution ◽  
History Of
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