Gamma-ray response functions for scintillation and semiconductor detectors

Mitchell, Dean J.; Sanger, H.M.; Marlow, K.W.

doi:10.1016/0168-9002(89)90582-2

Cited by 31 publications

(11 citation statements)

References 5 publications

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“…A second program, MIXER, generated the blended trial basis spectra (C,~, {c,}) as in Eqn. (4). The C program BINARY automated the nonlinear isotopic analysis for binary mixtures by generating the trial yA values and alternately spawning the MIXER and GROSSFIT programs.…”

Section: Experimental Details and Data Handlingmentioning

confidence: 99%

“…It was recently shown [l] that a logarithmic gammaray response function analysis technique used in tomographic assays [2,3] can be modified to solve for the isotopic composition of an unknown radioactive source attenuated by an absorber of unknown composition, a problem that previously required extensive radiation transport computations [4] to solve. Because this new approach -termed the gross-count material basis set (GC-MBS) method -works with NaI, CdZnTe, or other low-resolution detectors, it has potential application in portable hand-held radiation monitors.…”

Section: Introductionmentioning

confidence: 99%

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An innovative method for extracting isotopic information from low-resolution gamma spectra

Miko

Estep

Rawool-Sullivan

1999

Nuclear Instruments and Methods in Physics Research Section A:

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Section: Experimental Details and Data Handlingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An innovative method for extracting isotopic information from low-resolution gamma spectra

Miko

Estep

Rawool-Sullivan

1999

Nuclear Instruments and Methods in Physics Research Section A:

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“…One method of analysis is multiple linear regression of full energy standard spectra combining absorption, scattering and other interferences for an overall best fit. This technique was developed by Mitchell et.al (4) and has been used to analyze the spectra recorded in this study. As an example of this method, a 180-second spectrum of a fiestaware plate was recorded with an IdentiFINDER-U spectrometer and downloaded to a PC for analysis.…”

Section: Resultsmentioning

confidence: 99%

Uranium detection using small scintillators in a maritime environment

Hofstetter

Beals

Odell

2008

J Radioanal Nucl Chem

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The performance of several commercially available portable radiation spectrometers containing small NaI(Tl) scintillation detectors has been studied at the Savannah River National Laboratory (SRNL). These hand-held radioisotope identifiers are used by field personnel to detect and identify the illegal transport of uranium as a deterrent to undeclared nuclear proliferation or nuclear terrorism. The detection of uranium in a variety of chemical forms and isotopic enrichments presents some unique challenges in the maritime environment. This study was conducted using a variety of shielded and unshielded uranium sources in a simulated maritime environment. The results include estimates of the detection sensitivity for various isotopic enrichments and configurations using the manufacturer's spectral analysis firmware. More sophisticated methods for analyzing the spectra off-line are also evaluated to determine the detection limits and enrichment sensitivities from the field measurements.

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“…For the nuclides considered in this study ( 137 Cs, 235 U, and 238 U) the template library can produce a shielded template with an arbitrary Areal Density (AD) and Atomic Number (AN) within some ranges. The template library works by interpolating between basic templates generated using GADRAS (5)(6) to produce a new template corresponding to the AD and AN desired by the analysis software. To begin with, GADRAS was used to create spectra for each of the nuclides with 8 atomic numbers between 7 and 50, and 11 areal densities between 0 to 100 g/cm 2 a , yielding a total of 88 templates per nuclide.…”

Section: Generation Of Shielded Templatesmentioning

confidence: 99%

“…In section 3 the interpolation method for obtaining shielded target spectra at any set of shielding parameters is described. This interpolation uses a library of shielded spectra that is generated using GADRAS 1D models (5)(6) . Section 4 of the report shows results for two test cases, one with a single target radionuclide and the other with two.…”

Section: Introductionmentioning

confidence: 99%

Including shielding effects in application of the TPCA method for detection of embedded radiation sources.

Johnson¹,

Shokair²

2011

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Conventional full spectrum gamma spectroscopic analysis has the objective of quantitative identification of all the radionuclides present in a measurement. For low-energy resolution detectors such as NaI, when photopeaks alone are not sufficient for complete isotopic identification, such analysis requires template spectra for all the radionuclides present in the measurement. When many radionuclides are present it is difficult to make the correct identification and this process often requires many attempts to obtain a statistically valid solution by highly skilled spectroscopists.A previous report investigated using the targeted principal component analysis method (TPCA) for detection of embedded sources for RPM applications. This method uses spatial/temporal information from multiple spectral measurements to test the hypothesis of the presence of a target spectrum of interest in these measurements without the need to identify all the other radionuclides present. The previous analysis showed that the TPCA method has significant potential for automated detection of target radionuclides of interest, but did not include the effects of shielding. This report complements the previous analysis by including the effects of spectral distortion due to shielding effects for the same problem of detection of embedded sources. Two examples, one with one target radionuclide and the other with two, show that the TPCA method can successfully detect shielded targets in the presence of many other radionuclides. The shielding parameters are determined as part of the optimization process using interpolation of library spectra that are defined on a 2D grid of atomic numbers and areal densities.-4-

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Gamma-ray response functions for scintillation and semiconductor detectors

Cited by 31 publications

References 5 publications

An innovative method for extracting isotopic information from low-resolution gamma spectra

An innovative method for extracting isotopic information from low-resolution gamma spectra

Uranium detection using small scintillators in a maritime environment

Including shielding effects in application of the TPCA method for detection of embedded radiation sources.

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