A fresh approach to NaI scintillation detector spectrum analysis

East, L.V.; Phillips, Ron; Strong, Allan

doi:10.1016/0029-554x(82)90689-9

Cited by 11 publications

(2 citation statements)

References 3 publications

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“…The first technique proposed for doing this was peak erosion [87] but it was abandoned due to the dependence of the results on the number of iterations used in the erosion. The second technique is to fit the observed data to a mode1 of the energy spectra [88]-[92J.…”

Section: Triple Energy Windowmentioning

confidence: 99%

Analytical calculation of photon distributions in SPECT projections

Wells

Celler

Harrop

1998

IEEE Trans. Nucl. Sci.

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In this work is presented a method for analytically cdculating the distribution of photons detected in SPECT projections. The technique is appLicabIe to sources in homogeneous and non-homogeneous media. The photon distribution (primary, first and second order Compton scatter, and first order Rayleigh scatter) is computed using precdculated camera-dependent lookup tables in conjunction with an attenuation map of the scattering object aad a map of the activity distribution.The resdts of the technique are in excellent agreement with those of Monte Carlo simulation and experimental phantom studies. It has b e n validated with respect to sources in both homogeneous and noa-homogeneous media.Compared with a similar andyticd technique, it offers a factor of 40-60 decrease in the cdculation time for higher order Compton scatter distributions. For small sources, it improves on computation tirne required by Monte Carlo simulators by a factor of 20-150.Finally, this method has been applied to the problem of correcting for cross-taik in 1231-99mT~ dual-isotope SPECT studies. It has demonstrated the ability to accurately reproduce the shape of the cross-talk distribution and to reproduce the absolute activity of the sources to within 7%, dowing accurate removai of cross-talk contamination. Abstract. . 11

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Section: Triple Energy Windowmentioning

confidence: 99%

Analytical calculation of photon distributions in SPECT projections

Wells

Celler

Harrop

1998

IEEE Trans. Nucl. Sci.

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“…These algorithms are optimized for the analysis of low-resolution detectors as encountered in this application. The algorithm details are described in [5].…”

Section: Analysis For Low Resolution Detectorsmentioning

confidence: 99%

In-situ measurements and analysis of naturally occurring radioactive materials

Mueller

Ilie

Lange³

et al. 2013

2013 3rd International Conference on Advancements in Nuclear Instrumentation, Measurement Methods and Their Applications (ANIMM

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The measurement and quantification of naturally occurring radioactive materials (NORM) is an important element of workplace radioprotection in key industries such as oil and gas production, heavy metals mining and refining, coal burning waste, and water treatment. Monitoring of NORM content in home building materials is another challenge for human safety in the prevention of chronic dose uptake. Materials are classified NORM in case they contain significant amounts of the decay chains of U-238 (Ra-226 as a long lived daughter), U-235 or Th-232 or the primordial nuclide K-40.Due to the decay of the radionuclides, gamma rays with a signature in the energy range from 45 keV up to 2615 keV are emitted. The most accurate method to measure NORM in a sample is to use a high resolution spectrometric instrument such as a germanium detector in a well-shielded laboratory environment. The shield is used to prevent background with the same signature from the building material of the laboratory. There are occasions in which one is required to assay samples in the field. These in situ field applications may require performing measurements with reduced (or no) background shielding conditions, or involve the use of medium resolution spectrometric instruments such as LaBr3 or NaI detectors. In-situ analyses such as these have increased complexity. The reduced shielding enforces the subtraction of NORM events produced from the environment but the sample material and container can also shield the detector against this background thus biasing the measured results if not appropriately accounted.The use of medium resolution detectors has additional complications that the multiplicity of gamma-rays from NORM materials is such that most of the gamma-rays are interfering and thus require a very careful quantitative analysis. In this presentation, we will discuss the details of the NORM source term both in the environment and what could potentially be in the sample. We will also discuss the potential consequences if the NORM daughter products are not in secular equilibrium, and present procedures and guidelines for measuring and analyzing NORM samples in situ with both high and medium resolution spectrometry devices.

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Scatter correction in scintigraphy: the state of the art

et al. 1994

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In scintigraphy, the detection of scattered photons degrades both visual image analysis and quantitative accuracy. Many methods have been proposed and are still under investigation to cope with scattered photons. The main features of the problem of scattering in radionuclide imaging are presented first, to provide a sound foundation for a critical review of the existing scatter correction techniques. These are described using a classification relating to their aims and principles. Their theoretical potentials are analysed, as well as the difficulties of their practical implementation. Finally, the problems of their evaluation and comparison are discussed.

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A fresh approach to NaI scintillation detector spectrum analysis

Cited by 11 publications

References 3 publications

Analytical calculation of photon distributions in SPECT projections

Analytical calculation of photon distributions in SPECT projections

In-situ measurements and analysis of naturally occurring radioactive materials

Scatter correction in scintigraphy: the state of the art

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