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

Fantidis JG, Nicolaou GE, Potolias C, Vordos N, Bandekas DV - J Radioanal Nucl Chem (2011)

Bottom Line: 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 ((241)Am/Be, (252)Cf, (241)Am/B, and DT neutron generator).Among the different systems the (252)Cf neutron based PGNAA system has the best performance.

View Article: PubMed Central - PubMed

Affiliation: Department of Electrical Engineering, Kavala Institute of Technology, Kavala, Greece.

ABSTRACT

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 ((241)Am/Be, (252)Cf, (241)Am/B, and DT neutron generator). Among the different systems the (252)Cf neutron based PGNAA system has the best performance.

No MeSH data available.


3D view of the simulated experimental set-up (not in scale)
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Fig1: 3D view of the simulated experimental set-up (not in scale)

Mentions: The geometrical configuration of the arrangement used in the present simulation is represented in Fig. 1 and is similar to the one described previously, in Ref. 15 with a minor difference in geometry. Effectively, it comprises: (1) a cylindrical irradiation unit made of polyethylene, with a height and diameter of 100 cm, (2) a collimator made of Beryllium with 1 cm diameter, (3) a Perspex tube of length 50 cm with an inner diameter of about 1 cm runs through the y axis of the cylinder. The tube provides a path for the transfer of the neutron source from its resting to the irradiation position. The source can be moved between the shielded and the irradiation positions. When the unit operates (4) the source is situated near to the edge of the tube, 49 cm away from the center of the cylinder. Four different neutron sources were studied: (i) 241Am/Be, (ii) 252Cf, (iii) 241Am/B and (iv) DT neutron generator. Normalized neutron spectra for four sources are shown in Fig. 2. The irradiation object (5) is a cubic phantom with a side of 16 cm length. The cube contains water with homogeneously distributed 40 ppm of 10B. This is a typical quantity of boron in liver which is in the range of 8 to 50 ppm in the healthy and sickly liver, respectively [16, 17].Fig. 1


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

Fantidis JG, Nicolaou GE, Potolias C, Vordos N, Bandekas DV - J Radioanal Nucl Chem (2011)

3D view of the simulated experimental set-up (not in scale)
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4514448&req=5

Fig1: 3D view of the simulated experimental set-up (not in scale)
Mentions: The geometrical configuration of the arrangement used in the present simulation is represented in Fig. 1 and is similar to the one described previously, in Ref. 15 with a minor difference in geometry. Effectively, it comprises: (1) a cylindrical irradiation unit made of polyethylene, with a height and diameter of 100 cm, (2) a collimator made of Beryllium with 1 cm diameter, (3) a Perspex tube of length 50 cm with an inner diameter of about 1 cm runs through the y axis of the cylinder. The tube provides a path for the transfer of the neutron source from its resting to the irradiation position. The source can be moved between the shielded and the irradiation positions. When the unit operates (4) the source is situated near to the edge of the tube, 49 cm away from the center of the cylinder. Four different neutron sources were studied: (i) 241Am/Be, (ii) 252Cf, (iii) 241Am/B and (iv) DT neutron generator. Normalized neutron spectra for four sources are shown in Fig. 2. The irradiation object (5) is a cubic phantom with a side of 16 cm length. The cube contains water with homogeneously distributed 40 ppm of 10B. This is a typical quantity of boron in liver which is in the range of 8 to 50 ppm in the healthy and sickly liver, respectively [16, 17].Fig. 1

Bottom Line: 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 ((241)Am/Be, (252)Cf, (241)Am/B, and DT neutron generator).Among the different systems the (252)Cf neutron based PGNAA system has the best performance.

View Article: PubMed Central - PubMed

Affiliation: Department of Electrical Engineering, Kavala Institute of Technology, Kavala, Greece.

ABSTRACT

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 ((241)Am/Be, (252)Cf, (241)Am/B, and DT neutron generator). Among the different systems the (252)Cf neutron based PGNAA system has the best performance.

No MeSH data available.