Peak boundary selection in photopeak integration by the method of Covell

Heydorn, Κ.; Lada, W.

doi:10.1021/ac60322a006

Cited by 39 publications

(7 citation statements)

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“…Other programs for SLSF abound and some of these are referred to in [5]. When the fractional peak method used to evaluate photopeak areas independently of SLSF is used in conjunction with SP with rigorous control over all factors involved in the measurement of trace elements, it is sometimes referred to as the Perlman and Asaro system in the archaeological literature [1], Further details on this method may be found in the literature [14][15][16][17][18].…”

Section: Resultsmentioning

confidence: 99%

Gamma-Ray Spectral Map of Standard Pottery

Yellin

1984

Radiochimica Acta

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Neutron activation of pottery /Pottery standards /Gamma-ray analysis AbstractThe gamma-ray spectrum of a neutron activated Standard Pottery is analyzed completely by means of spectral line shape fitting. A detailed spectral map of the standard is presented as it is typically used in pottery analysis. The spectrum obtained by a planar geometry Ge(Li) detector covers the energy range 11 to 409 keV. The map is intended to serve as a guide to the uninitiated user of Standard Pottery as well as a basis of comparison with other standards employed in pottery provenience work. It is shown that the process of calibrating detectors for spectral line interference can be greatly aided by means of a general approach to spectrum analysis and that much usefull information can be obtained by a general approach to pottery spectrum analysis.

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Section: Resultsmentioning

confidence: 99%

Gamma-Ray Spectral Map of Standard Pottery

Yellin

1984

Radiochimica Acta

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“…The former can be made very large relative to the latter, are fairly dense ( p = 3.7) and one of their constituents, iodine (2 = 53), has a high atomic number. Atomic photoelectric crosssections are proportional to 2 raised to a power of between 4 and 5 depending on incident y-ray energy (1 ). Despite the fact that NaI and Ge have the same average 2 (32), a y photon is more likely to undergo a photoelectric event in unit volume in NaI than in Ge, even taking into account the greater density of the latter, Le.…”

Section: Discussionmentioning

confidence: 99%

Low level .gamma.-ray spectrometry. Thallium-doped sodium iodide vs. lithium-doped germanium

Robertson¹,

Spyrou²,

Kennett³

1975

Anal. Chem.

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every case the average values are in good agreement with the correct values. This indicates that there is no appreciable systematic error in the method, and reliable absolute concentrations may be determined if replicate runs are made.More work is needed to uncover the source of scatter in the data. Volumetric and gravimetric errors did not exceed 2% each. The isotopic ration measurements are accurate to about the same figure, as shown by measurement of both the singly and doubly charged ion ratios. Loss during sample dissolution does not appear to be a consistent explanation because it would produce systematic errors, not just scatter. One possibility is that chemical equilibrium between the components of the spike solution and the corresponding components of the sample solution does not occur before addition of the graphite and subsequent heating to dryness. This could result in selective distillation during the drying process of one component or the other, depending on conditions. Another possibility is immediate precipitation upon addition of the spikes.The technique investigated here is the simplest and fastest possible. If several samples are prepared a t one time, total preparation time per 10 element sample would be about 1% hours. Only about 5 minutes is required to cut a sample for direct sparking. However, no standard is required for the isotope dilution method, so that the overall analysis time is about the same as for direct sparking with electrical detection.Assuming that the precision can be improved, the main disadvantages of the isotope dilution method are: 1) Two of the most important elements in bullet lead, As and Bi, cannot be determined. 2) An order of magnitude estimate of the elemental concentration is needed in order to spike a t the optimum level. This means that the isotope dilution method could best serve as an adjunct to the direct sparking method, yielding absolute concentrations for those elements for which no standards are available and providing a valuable check on other elements.In the comparison of a 42 cm3 Ge(Li) and a standard 7.6 X 7.6 cm Nal(TI) detector for the y-ray spectrometry of low intensity, non-complex sources, it has been shown that there exists some source intensity, lcritlcai, for which two compared detection systems yield identical precision for identical count time. lcritlcai was found here to be -1 photon sec-' between 140 and 1600 keV. Below this intensity, the Ge( Ll) system always yields superior precislon whereas Present address, Department of Chemistry, McMaster University, Hamilton, Ontario, Canada. above lcrnlcal the Nal(TI) system Is ascendant. This result is contrary to that expected using arguments based on counting efficiency considerations alone. Optimum peak integration limits have been derived for low signal-to-noise ratio conditions assuming a Gaussian peak shape. Even in the most unfavorable case, where the signal-to-nolse ratio is approaching zero, integration should be performed across at least 84% of the peak area, Le., between limits of f1.4...

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“…By knowing the ratio of the integrated areas from standard deviations, the analysis would be made more efficient (Squires, 2001). In the peak area integration procedure on the other hand, the Covell method was based on locating the peak centroid first and then limiting the peak range equally on both sides of the peak's centroid channel (Heydorn & Lada, 1972). This was simply shown in Fig.…”

Section: Methodology and Analysismentioning

confidence: 99%

“…By doing so, relevant background subtraction and fitting methods will be presented respectively. The tools for investigation in this study were Maestro software calculations (A65-B32 Software's User's Manual, 2020), Covell method (Gilmore, 2008;Heydorn & Lada, 1972;Covell, 1959), Total Peak Area (TPA) method (Covell, 1959;Loska, 1987), and the ROOT coding via fittings.…”

Section: Introductionmentioning

confidence: 99%

The Usage of ROOT in Analyzing Gamma-rays with Covell and Total Peak Area Methods

Celik¹

2021

European Journal of Science and Technology

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ROOT is a framework for a physicist to save data, to access the data, to mine the data and to publish results in a graphical interface. As a gamma ray spectroscopist, one of the most useful features of it is to estimate and to calculate the integral of a peak area. When this is done, not always these peaks can be isolated easily. Also, the methods differ the results of the total counts under the peak areas. Regardless of the detector types, the written C++ codes for ROOT can be easily implemented and adjusted for any peak situation. As an example, Maestro, which is a multichannel analyzer (MCA) emulation software package, is one of the most common software for NaI detector type. However, the users of this package mostly do not know the details of its procedure to collect and integrate the total counts for each individual gamma-ray. For that reason, it will be useful to indicate the comparisons for an experimental data by using Covell and Total Peak Area (TPA) methods between ROOT and Maestro.

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Peak boundary selection in photopeak integration by the method of Covell

Cited by 39 publications

References 5 publications

Gamma-Ray Spectral Map of Standard Pottery

Gamma-Ray Spectral Map of Standard Pottery

Low level .gamma.-ray spectrometry. Thallium-doped sodium iodide vs. lithium-doped germanium

The Usage of ROOT in Analyzing Gamma-rays with Covell and Total Peak Area Methods

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