Neutron ambe srim

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Trying to calculate how far alpha particles can penetrate into Be. ie whats an ideal foil size for neutron production: thicker foils moderate produced neutrons

Be

 ========================================================
               SRIM version ---> SRIM-2013.00
               Calc. date   ---> December 29, 2015 
 ========================================================
 
  Disk File Name = SRIM Outputs\Helium in Beryllium.txt
 
  Ion = Helium [2] , Mass = 4 amu
 
  Target Density =  1.8480E+00 g/cm3 = 1.2349E+23 atoms/cm3
 == Target  Composition ===
     Atom   Atom   Atomic    Mass     
     Name   Numb   Percent   Percent  
 ##---   ----   -------   -------  
      Be      4    100.00    100.00   
 ==========================
  Bragg Correction = 0.00%
  Stopping Units =  MeV / (mg/cm2) 
  See bottom of Table for other Stopping units 
 
         Ion        dE/dx      dE/dx     Projected  Longitudinal   Lateral
        Energy      Elec.      Nuclear     Range     Straggling   Straggling
 #-------------  ---------- ---------- ----------  ----------  ----------
    5.40 MeV   7.068E-01  4.032E-04   27.71 um     1.01 um     4314 A   
 -----------------------------------------------------------
  Multiply Stopping by        for Stopping Units
  -------------------        ------------------
   1.8479E+01                 eV / Angstrom 
   1.8479E+02                keV / micron   
   1.8479E+02                MeV / mm       
   1.0000E+00                keV / (ug/cm2) 
   1.0000E+00                MeV / (mg/cm2) 
   1.0000E+03                keV / (mg/cm2) 
   1.4965E+01                 eV / (1E15 atoms/cm2)
   1.4574E+00                L.S.S. reduced units
 ========================================================
  (C) 1984,1989,1992,1998,2008 by J.P. Biersack and J.F. Ziegler


C17200

 ========================================================
               SRIM version ---> SRIM-2013.00
               Calc. date   ---> December 29, 2015 
 ========================================================
 
  Disk File Name = SRIM Outputs\Helium in Be-Cu.txt
 
  Ion = Helium [2] , Mass = 4 amu
 
  Target Density =  8.2500E+00 g/cm3 = 8.7066E+22 atoms/cm3
 == Target  Composition ===
     Atom   Atom   Atomic    Mass     
     Name   Numb   Percent   Percent  
 ##---   ----   -------   -------  
      Be      4    011.89    001.88   
      Cu     29    088.11    098.12   
 ==========================
  Bragg Correction = 0.00%
  Stopping Units =  MeV / (mg/cm2) 
  See bottom of Table for other Stopping units 
 
         Ion        dE/dx      dE/dx     Projected  Longitudinal   Lateral
        Energy      Elec.      Nuclear     Range     Straggling   Straggling
 #-------------  ---------- ---------- ----------  ----------  ----------
    5.40 MeV   4.123E-01  3.322E-04   11.93 um     5328 A      6806 A   
 -----------------------------------------------------------
  Multiply Stopping by        for Stopping Units
  -------------------        ------------------
   8.2497E+01                 eV / Angstrom 
   8.2497E+02                keV / micron   
   8.2497E+02                MeV / mm       
   1.0000E+00                keV / (ug/cm2) 
   1.0000E+00                MeV / (mg/cm2) 
   1.0000E+03                keV / (mg/cm2) 
   9.4753E+01                 eV / (1E15 atoms/cm2)
   1.0575E+01                L.S.S. reduced units
 ========================================================
  (C) 1984,1989,1992,1998,2008 by J.P. Biersack and J.F. Ziegler