EBK INTRODUCTION TO HEALTH PHYSICS, FIF
EBK INTRODUCTION TO HEALTH PHYSICS, FIF
5th Edition
ISBN: 9780071835268
Author: Johnson
Publisher: VST
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Chapter 5, Problem 5.40P

(a)

To determine

To Calculate: Macroscopic capture cross section.

(a)

Expert Solution
Check Mark

Answer to Problem 5.40P

Macroscopic capture cross section =0.243cm1

Explanation of Solution

Given:

    FeCrNi
    AAbun(%)σC (b) AAbun(%)σC (b) AAbun(%)σC (b)
    545.842.3504.3515.95868.084.6
    5691.752.65283.790.756026.222.8
    572.122.4539.5018.1611.142.5
    580.281.1542.370.36623.63514.4
    640.9261.5

Weight percent:

Fe = 71%

Cr = 19%

Ni = 10%

Formula used:

  = ρ×1mole×σ×(percentabundence) gramatomicwgt= ρ×1mole×σ×b×1× 10 24 ×(fractionalabundence) gramatomicwgt×b

Calculation:

Using the above equation calculation was done:

    1234567
    Fe7.874540.05842.30.0117946
    Fe7.874560.91752.60.20198892
    Fe7.874570.02122.40.00423261
    Fe7.874580.00281.10.0002518
    total0.21826793
    Fe total0.15497023
    Cr7.19500.043515.90.05989437
    Cr7.19520.83790.750.05232627
    Cr7.19530.09518.10.140474
    Cr7.19540.02370.360.00068411
    total0.25337875
    Cr total0.04814196
    Ni8.908580.68084.60.28964787
    Ni8.908600.26222.80.06563877
    Ni8.908610.01142.50.00250632
    Ni8.908620.0363514.40.04528936
    Ni8.908640.009261.50.00116424
    total0.40424656
    Ni total0.04042466
    TOTAL0.24353685

Conclusion:

Macroscopic capture cross section =0.243cm1

(b)

To determine

The number of captured neutrons per second

(b)

Expert Solution
Check Mark

Answer to Problem 5.40P

The number of captured neutrons per second =1.96×1010n/sec

Explanation of Solution

Given:

  I0=5×1011neutrons/cm2st=0.2cm=0.243cm 1

Formula used:

  II0=et

Calculation:

From the above equation,

  II0=et=e0.243×0.2=0.95

Therefore, 10.95=0.05 are captured

1 cm diameter correspond to an area of =0.7854cm2

The number of captured neutrons can be calculated as,

  =0.05×5×1011×0.7854=1.96×1010n/s

Conclusion:

The number of captured neutrons per second =1.96×1010n/s

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