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Question Water VS G4_WATER 

Forum: Geometry
Date: 03 Feb, 2010
From: Daniel Sánchez Parcerisa <Daniel Sánchez Parcerisa>

I am not entirely sure this post belongs here, if it doesn't please refer me to the right forum.

I am simulating a beam of carbon ions through water, and the results (namely the depth dose distribution) vary dramatically (a shift of more than 3mm of Bragg Peak position) when using G4_WATER or user-defined Water material.

I define Water material using NIST definitions for O and H; I have copied the ionization potential (78.0 eV) and the weights from the G4NistMaterialBuilder (H: 11.1894 %, O: 88.8106%), also the density (1.0 g/cm3), temperature (STD_Temperature) and pressure (STD_Pressure) are equal to those in the definition. In G4NistMaterialBuilder, G4_WATER seems to be defined as a solid; I have tried defining my "Water" as solid, liquid or undefined; still getting a shift of 3mm.

Outputs from material table are:
Absorber Material: 
 Material: G4_WATER H_2O   density:  1.000 g/cm3   RadL:  36.083 cm   Nucl.Int.Length:  75.505 cm   Imean:  78.000 eV 
   --->  Element: H (H)   Z =  1.0   N =   1.0   A =   1.01 g/mole
   --->  Isotope:    H1   Z =  1   N =   1   A =   1.01 g/mole   abundance:  99.99 %
   --->  Isotope:    H2   Z =  1   N =   2   A =   2.01 g/mole   abundance:   0.01 %  ElmMassFraction:  11.19 %  ElmAbundance  66.67 %
   --->  Element: O (O)   Z =  8.0   N =  16.0   A =  16.00 g/mole
   --->  Isotope:   O16   Z =  8   N =  16   A =  15.99 g/mole   abundance:  99.76 %
   --->  Isotope:   O17   Z =  8   N =  17   A =  17.00 g/mole   abundance:   0.04 %
   --->  Isotope:   O18   Z =  8   N =  18   A =  18.00 g/mole   abundance:   0.20 %  ElmMassFraction:  88.81 %  ElmAbundance  33.33 %

Absorber Material: 
 Material:    Water     density:  1.000 g/cm3   RadL:  36.083 cm   Nucl.Int.Length:  75.505 cm   Imean:  78.000 eV 
   --->  Element: H (H)   Z =  1.0   N =   1.0   A =   1.01 g/mole
   --->  Isotope:    H1   Z =  1   N =   1   A =   1.01 g/mole   abundance:  99.99 %
   --->  Isotope:    H2   Z =  1   N =   2   A =   2.01 g/mole   abundance:   0.01 %  ElmMassFraction:  11.19 %  ElmAbundance  66.67 %
   --->  Element: O (O)   Z =  8.0   N =  16.0   A =  16.00 g/mole
   --->  Isotope:   O16   Z =  8   N =  16   A =  15.99 g/mole   abundance:  99.76 %
   --->  Isotope:   O17   Z =  8   N =  17   A =  17.00 g/mole   abundance:   0.04 %
   --->  Isotope:   O18   Z =  8   N =  18   A =  18.00 g/mole   abundance:   0.20 %  ElmMassFraction:  88.81 %  ElmAbundance  33.33 %

Can anyone give me a hint on where this can be coming from?

Cheers

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1 Idea: Re: Water VS G4_WATER   (Vladimir Ivanchenko - 03 Feb, 2010)
1 Question: Re: Water VS G4_WATER   (Daniel Sánchez Parcerisa - 03 Feb, 2010)
1 Idea: Re: Water VS G4_WATER   (Vladimir Ivanchenko - 05 Feb, 2010)
2 None: Re: Water VS G4_WATER   (michel maire - 05 Feb, 2010)
1 Ok: Re: Water VS G4_WATER   (Daniel Sánchez Parcerisa - 08 Feb, 2010)
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