Difference between revisions of "Fast neutron damage to HPGe Detector"

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A decrease in the energy resolution of a large HPGe was first seen after the irradiation of <math>5\times 10^7 n/cm^2 </math><ref>P. H. Stelson, J. K. Dickens, S. Raman, and R. C. Trammell, “Deterioration of Large Ge(Li) Diodes Caused by Fast Neutrons,” Nuclear Instruments and Methods 98,481 (1972).</ref>, so <math>5\times 10^6 n/cm^2 </math> is a safe number to stay under.  
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A decrease in the energy resolution of a large HPGe was first seen after the irradiation of 5*10^7 n/cm^2<ref>P. H. Stelson, J. K. Dickens, S. Raman, and R. C. Trammell, “Deterioration of Large Ge(Li) Diodes Caused by Fast Neutrons,” Nuclear Instruments and Methods 98,481 (1972).</ref>, so 5*10^6 n/cm^2 is a safe number to stay under.  
  
 
The maximum flux occurs right at the center of the detector, where the expression for flux simplifies to <math>n_{rate}\frac{1}{4\pi d^2}</math>.  The number of days it would take to reach an integral flux of <math>5\times 10^6 n/cm^2 </math> as a function of the CF-252 source distance HPGe face is shown below. The graph assumes the activity of the Cf252 source on 01/2017, which is 19066 n/s.  
 
The maximum flux occurs right at the center of the detector, where the expression for flux simplifies to <math>n_{rate}\frac{1}{4\pi d^2}</math>.  The number of days it would take to reach an integral flux of <math>5\times 10^6 n/cm^2 </math> as a function of the CF-252 source distance HPGe face is shown below. The graph assumes the activity of the Cf252 source on 01/2017, which is 19066 n/s.  

Revision as of 06:15, 29 December 2016

A decrease in the energy resolution of a large HPGe was first seen after the irradiation of 5*10^7 n/cm^2<ref>P. H. Stelson, J. K. Dickens, S. Raman, and R. C. Trammell, “Deterioration of Large Ge(Li) Diodes Caused by Fast Neutrons,” Nuclear Instruments and Methods 98,481 (1972).</ref>, so 5*10^6 n/cm^2 is a safe number to stay under.

The maximum flux occurs right at the center of the detector, where the expression for flux simplifies to nrate14πd2. The number of days it would take to reach an integral flux of 5×106n/cm2 as a function of the CF-252 source distance HPGe face is shown below. The graph assumes the activity of the Cf252 source on 01/2017, which is 19066 n/s.


References

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