Modern Physics Krane CH 13 # 7 Neutron capture in sodium occurs with a cross sec

Question

Modern Physics Krane CH 13 # 7 Neutron capture in sodium occurs with a cross section of .53barns and leads to radioactive 24Na (t1/2= 15 hrs) What is theactivity that results when a 1.0 ug of Na is placed in a neutronflux of 2.5E13 neutrons/cm2 for 4 hrs.? ans 1.58 uCi Modern Physics Krane CH 13 # 7 Neutron capture in sodium occurs with a cross section of .53barns and leads to radioactive 24Na (t1/2= 15 hrs) What is theactivity that results when a 1.0 ug of Na is placed in a neutronflux of 2.5E13 neutrons/cm2 for 4 hrs.? ans 1.58 uCi

Explanation / Answer

   Given : R = 2.5 * 1013 ( 0.53b ) ( 10-24cm2 / b ) ( 10-6 /24 ) ( 6.02 *1023 )    R = 3.32 * 105 s    Half life time   T1/2 = ln 2 /                                  = ln 2 / T1/2                                       = ln 2 / 15                          = 0.0462/hr      A = RT = ( 3.32 *105 s ) ( 0.0462/hr ) ( 4 )hr              A= 6.14 * 104 neutrons / s    I hope it helps you                                                                   = ln 2 / 15                          = 0.0462/hr      A = RT = ( 3.32 *105 s ) ( 0.0462/hr ) ( 4 )hr              A= 6.14 * 104 neutrons / s    I hope it helps you                            

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