The comparison of two MCNP models used for prompt gamma in vivo detection of cadmium and mercury

Atanackovic, J.; Grinyer, J.; Chettle, David R.; Byun, S.H.

doi:10.1016/j.nimb.2007.04.078

Cited by 12 publications

(10 citation statements)

References 4 publications

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“…For quantitative analysis, we used the absolute method and the gamma detection efficiency determined experimentally, with the prompt gamma from chlorine dissolved in a water sample used as the reference sample. Changes in the thermal neutron flux are treated using measures of thermal neutron flux performed with a 3 He counter. For the gamma attenuation in the samples, we used attenuation factors calculated with the MCNP5 code.…”

Section: Resultsmentioning

confidence: 99%

“…They were packaged in plastic bags and weighed to determine their densities. The densities were found to be 1.47 g/cm 3 for the dehydrated sample and 0.956 g/cm 3 for the hydrated one. To compare the results obtained with PGNAA to those determined with chemical and physical analysis methods (atomic absorption and ICP), samples were freeze-dried and chemically treated to obtain solutions.…”

Section: Samplingmentioning

confidence: 91%

“…The detector is placed in the center of the sample container directly touching its external surface. In order to monitor the thermal neutron flux inside the sample, a 3 He neutron detector is placed on the opposite side of the sample container. The center of the neutron detector is adjacent to the plane perpendicular to the sample axis and passing by the center of the sample.…”

Section: Methodsmentioning

confidence: 99%

“…It also necessitates the knowledge of the average thermal neutron flux ϕ in the unknown sample and the average gamma detection efficiency ϵ . The average thermal flux is deduced by normalizing the average thermal neutron flux in the water sample calculated with MCNP and using the flux measurements of thermal flux carried out with the 3 He detector on the surface sample holder respectively for water as reference sample and unknown sample.…”

Section: Methodsmentioning

confidence: 99%

“…[1][2][3] This is made possible not only by easily transportable isotopic neutron sources but also with the development of very efficient portable gamma ray detectors and associated electronics. In a previous work, 4 a prompt gamma neutron activation analysis set-up for water reject analysis has been described and optimized using Monte Carlo neutron transport calculations with the MCNP5 code.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of sewage sludge using an experimental prompt gamma neutron activation analysis (pgnaa) set-up with an am-be source

Idiri

Redjem

Beloudah

2016

Int. J. Mod. Phys. Conf. Ser.

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An experimental PGNAA set-up using a 1 Ci Am-Be source has been developed and used for analysis of bulk sewage sludge samples issued from a wastewater treatment plant situated in an industrial area of Algiers. The sample dimensions were optimized using thermal neutron flux calculations carried out with the MCNP5 Monte Carlo Code. A methodology is then proposed to perform quantitative analysis using the absolute method. For this, average thermal neutron flux inside the sludge samples is deduced using average thermal neutron flux in reference water samples and thermal flux measurements with the aid of a 3 He neutron detector. The average absolute gamma detection efficiency is determined using the prompt gammas emitted by chlorine dissolved in a water sample. The gamma detection efficiency is normalized for sludge samples using gamma attenuation factors calculated with the MCNP5 code for water and sludge. Wet and dehydrated sludge samples were analyzed. Nutritive elements (Ca, N, P, K) and heavy metals elements like Cr and Mn were determined. For some elements, the PGNAA values were compared to those obtained using Atomic Absorption Spectroscopy (AAS) and Inductively Coupled Plasma (ICP) methods. Good agreement is observed between the different values. Heavy element concentrations are very high compared to normal values; this is related to the fact that the wastewater treatment plant is treating not only domestic but also industrial wastewater that is probably rejected by industries without removal of pollutant elements. The detection limits for almost all elements of interest are sufficiently low for the method to be well suited for such analysis.

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Section: Resultsmentioning

confidence: 99%

Section: Samplingmentioning

confidence: 91%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Analysis of sewage sludge using an experimental prompt gamma neutron activation analysis (pgnaa) set-up with an am-be source

Idiri

Redjem

Beloudah

2016

Int. J. Mod. Phys. Conf. Ser.

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The comparison of four neutron sources for Prompt Gamma Neutron Activation Analysis (PGNAA) in vivo detections of boron

Fantidis

Nicolaou

Potolias

et al. 2011

J Radioanal Nucl Chem

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A Prompt Gamma Ray Neutron Activation Analysis (PGNAA) system, incorporating an isotopic neutron source has been simulated using the MCNPX Monte Carlo code. In order to improve the signal to noise ratio different collimators and a filter were placed between the neutron source and the object. The effect of the positioning of the neutron beam and the detector relative to the object has been studied. In this work the optimisation procedure is demonstrated for boron. Monte Carlo calculations were carried out to compare the performance of the proposed PGNAA system using four different neutron sources (241Am/Be, 252Cf, 241Am/B, and DT neutron generator). Among the different systems the 252Cf neutron based PGNAA system has the best performance.

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Shielding optimization in an in vivo activation analysis setup

Moghaddam

Rafat-Motavalli

Hakimabad

2012

J Radioanal Nucl Chem

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The comparison of two MCNP models used for prompt gamma in vivo detection of cadmium and mercury

Cited by 12 publications

References 4 publications

Analysis of sewage sludge using an experimental prompt gamma neutron activation analysis (pgnaa) set-up with an am-be source

Analysis of sewage sludge using an experimental prompt gamma neutron activation analysis (pgnaa) set-up with an am-be source

The comparison of four neutron sources for Prompt Gamma Neutron Activation Analysis (PGNAA) in vivo detections of boron

Shielding optimization in an in vivo activation analysis setup

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