Some modifications to Sima’s model for total efficiency calculation of well-type detectors

Pommé, S.; Sibbens, G.; Vidmar, T.; Spasova, Y.

doi:10.1007/s10967-009-0066-y

Cited by 7 publications

(9 citation statements)

References 5 publications

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“…The resulting efficiency values differ by typically 0.29% (median absolute deviation) with the analytical model calculations. The graph shows also a comparison with efficiencies calculated with an adapted version of Sima's simple model [6]. Also this model performs surprisingly well, even though the deviation from simulations may amount to a few percent in the low-energy region.…”

Section: Photonsmentioning

confidence: 88%

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Detection efficiency calculation for photons, electrons and positrons in a well detector. Part II: Analytical model versus simulations

Pommé

Sibbens

Vidmar

et al. 2009

Nuclear Instruments and Methods in Physics Research Section A:

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Section: Photonsmentioning

confidence: 88%

“…The three codes used were MCNP 5.1.40 [2], GEANT3 [3] and, to a lesser extent, PENELOPE [4]. For one configuration, a comparison is also made with a simpler analytical model by Sima [5] with adaptations by Pommé et al [6]. At this stage, no experimental verifications were done, only the level of equivalence of the models was examined.…”

Section: Introductionmentioning

confidence: 99%

Detection efficiency calculation for photons, electrons and positrons in a well detector. Part II: Analytical model versus simulations

Pommé

Sibbens

Vidmar

et al. 2009

Nuclear Instruments and Methods in Physics Research Section A:

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“…The 4πmix-CsI counting method is akin to 4πγ counting with NaI(Tl) well detectors [21], except that the counting efficiency for particles adds significantly to the total detection probability. At that time, no dedicated software like STEFFY [22][23][24][25] or Monte Carlo routines were used for the efficiency calculation. The detection inefficiency was estimated at 0.03%, since the chance is low that no detectable pulse per decay is generated by the alpha particle, gamma rays, x rays, or secondary electrons.…”

Section: π Csi(tl) Sandwich Spectrometermentioning

confidence: 99%

Standardisation of 241Am activity for a key comparison

Pommé

Altzitzoglou

Ammel

et al. 2021

J Radioanal Nucl Chem

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The JRC applied six measurement techniques to standardise the activity of an 241Am solution in the frame of the 2003 key comparison CCRI(II)-K2.Am-241. The methods used were alpha-particle counting at a defined small solid angle, high-efficiency particle and photon counting with a windowless 4π CsI(Tl) sandwich spectrometer, 4π alpha counting with a pressurised proportional counter, alpha-gamma coincidence counting and sum counting with a small pressurised proportional counter and a NaI(Tl) well detector, and 4π counting with a liquid scintillation counter. All results were consistent and an unusually low measurement uncertainty of 0.054% was achieved. An overview is presented of the outcome of the key comparison exercise, which demonstrates international equivalence.

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“…The total detection efficiency for a photon with energy E in a NaI well detector can be calculated from a simplified model [16,17]:…”

Section: Photonsmentioning

confidence: 99%

Assessment of the uncertainty budget associated with 4πγcounting

et al. 2015

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The 4πγ-counting technique is recognized as a powerful primary method for the standardization of radionuclides decaying with abundant gamma emissions. Based on the use of a gamma detector in quasi 4π-geometry, a detection efficiency close to 100% and a low uncertainty can be achieved thanks to the summing effect of subsequent gamma transitions. Uncertainties have to be assigned to the realistic modelling of the source-detector geometry with respect to dimensions, density and material composition, the calculation of the total counting efficiency of the detector for the various emitted radiation, and the effect of possible flaws in the decay scheme of a radionuclide on the calculated total efficiency. Other uncertainty factors pertain to typical metrological sources of uncertainty, such as weighing, nuclear counting with pulse pile-up and system dead-time effects, impurity corrections, decay corrections, timing and frequency, etc. In order to ensure good metrological practices at NMIs, the uncertainties particular to the method are discussed.

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Some modifications to Sima’s model for total efficiency calculation of well-type detectors

Cited by 7 publications

References 5 publications

Detection efficiency calculation for photons, electrons and positrons in a well detector. Part II: Analytical model versus simulations

Detection efficiency calculation for photons, electrons and positrons in a well detector. Part II: Analytical model versus simulations

Standardisation of 241Am activity for a key comparison

Assessment of the uncertainty budget associated with 4πγcounting

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