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Effect of diameter of nanoparticles and capture cross-section library on macroscopic dose enhancement in boron neutron capture therapy.

Farhood B, Ghorbani M - J Contemp Brachytherapy (2014)

Bottom Line: Additionally, the effect of ENDF, JEFF, JENDL, and CENDL neutron capture cross-section libraries on MDEF was evaluated.Furthermore, the boron capture related dose component reduced in some extent with increase of diameter of (10)B nanoparticles.Based on the results of this study, it can be concluded that from physical point of view, various nanoparticle diameters have no dominant effect on average MDEF value in tumor.

View Article: PubMed Central - PubMed

Affiliation: Medical Physics Department, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran.

ABSTRACT

Purpose: The aim of this study is evaluation of the effect of diameter of (10)B nanoparticles and various neutron capture cross-section libraries on macroscopic dose enhancement in boron neutron capture therapy (BNCT).

Material and methods: MCNPX Monte Carlo code was used for simulation of a (252)Cf source, a soft tissue phantom and a tumor containing (10)B nanoparticles. Using (252)Cf as a neutron source, macroscopic dose enhancement factor (MDEF) and total dose rate in tumor in the presence of 100, 200, and 500 ppm of (10)B nanoparticles with 25 nm, 50 nm, and 100 nm diameters were calculated. Additionally, the effect of ENDF, JEFF, JENDL, and CENDL neutron capture cross-section libraries on MDEF was evaluated.

Results: There is not a linear relationship between the average MDEF value and nanoparticles' diameter but the average MDEF grows with increased concentration of (10)B nanoparticles. There is an increasing trend for average MDEF with the tumor distance. The average MDEF values were obtained the same for various neutron capture cross-section libraries. The maximum and minimum doses that effect on the total dose in tumor were neutron and secondary photon doses, respectively. Furthermore, the boron capture related dose component reduced in some extent with increase of diameter of (10)B nanoparticles.

Conclusions: Based on the results of this study, it can be concluded that from physical point of view, various nanoparticle diameters have no dominant effect on average MDEF value in tumor. Furthermore, it is concluded that various neutron capture cross-section libraries are resulted to the same macroscopic dose enhancements. However, it is predicted that taking into account the biological effects for various nanoparticle diameters will result in different dose enhancements.

No MeSH data available.


Related in: MedlinePlus

Macroscopic dose enhancement factor (part A) and total dose rate (part B) in tumor for 25, 50, and 100 nm 10B nanoparticles with 500 ppm concentration of 10B nanoparticles (with ENDF capture cross-section library)
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Figure 0002: Macroscopic dose enhancement factor (part A) and total dose rate (part B) in tumor for 25, 50, and 100 nm 10B nanoparticles with 500 ppm concentration of 10B nanoparticles (with ENDF capture cross-section library)

Mentions: The plots of MDEF and the total dose rate values (cGy/(h· µg)) inside the tumor versus radial distance from the 252Cf source are shown in Figure 2 for different diameters of 10B nanoparticles. In this figure, parts (A) and (B) are related to MDEF and total dose rate, respectively.


Effect of diameter of nanoparticles and capture cross-section library on macroscopic dose enhancement in boron neutron capture therapy.

Farhood B, Ghorbani M - J Contemp Brachytherapy (2014)

Macroscopic dose enhancement factor (part A) and total dose rate (part B) in tumor for 25, 50, and 100 nm 10B nanoparticles with 500 ppm concentration of 10B nanoparticles (with ENDF capture cross-section library)
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4300365&req=5

Figure 0002: Macroscopic dose enhancement factor (part A) and total dose rate (part B) in tumor for 25, 50, and 100 nm 10B nanoparticles with 500 ppm concentration of 10B nanoparticles (with ENDF capture cross-section library)
Mentions: The plots of MDEF and the total dose rate values (cGy/(h· µg)) inside the tumor versus radial distance from the 252Cf source are shown in Figure 2 for different diameters of 10B nanoparticles. In this figure, parts (A) and (B) are related to MDEF and total dose rate, respectively.

Bottom Line: Additionally, the effect of ENDF, JEFF, JENDL, and CENDL neutron capture cross-section libraries on MDEF was evaluated.Furthermore, the boron capture related dose component reduced in some extent with increase of diameter of (10)B nanoparticles.Based on the results of this study, it can be concluded that from physical point of view, various nanoparticle diameters have no dominant effect on average MDEF value in tumor.

View Article: PubMed Central - PubMed

Affiliation: Medical Physics Department, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran.

ABSTRACT

Purpose: The aim of this study is evaluation of the effect of diameter of (10)B nanoparticles and various neutron capture cross-section libraries on macroscopic dose enhancement in boron neutron capture therapy (BNCT).

Material and methods: MCNPX Monte Carlo code was used for simulation of a (252)Cf source, a soft tissue phantom and a tumor containing (10)B nanoparticles. Using (252)Cf as a neutron source, macroscopic dose enhancement factor (MDEF) and total dose rate in tumor in the presence of 100, 200, and 500 ppm of (10)B nanoparticles with 25 nm, 50 nm, and 100 nm diameters were calculated. Additionally, the effect of ENDF, JEFF, JENDL, and CENDL neutron capture cross-section libraries on MDEF was evaluated.

Results: There is not a linear relationship between the average MDEF value and nanoparticles' diameter but the average MDEF grows with increased concentration of (10)B nanoparticles. There is an increasing trend for average MDEF with the tumor distance. The average MDEF values were obtained the same for various neutron capture cross-section libraries. The maximum and minimum doses that effect on the total dose in tumor were neutron and secondary photon doses, respectively. Furthermore, the boron capture related dose component reduced in some extent with increase of diameter of (10)B nanoparticles.

Conclusions: Based on the results of this study, it can be concluded that from physical point of view, various nanoparticle diameters have no dominant effect on average MDEF value in tumor. Furthermore, it is concluded that various neutron capture cross-section libraries are resulted to the same macroscopic dose enhancements. However, it is predicted that taking into account the biological effects for various nanoparticle diameters will result in different dose enhancements.

No MeSH data available.


Related in: MedlinePlus