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. | 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. | ||
| − | 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 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 hours taken 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. This graph assumes the current activity of the Cf252 source on 01/2017. |
Revision as of 06:11, 29 December 2016
A decrease in the energy resolution of a large HPGe was first seen after the irradiation of <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 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 . The number of hours taken to reach an integral flux of , as a function of the CF-252 source distance HPGe face, is shown below. This graph assumes the current activity of the Cf252 source on 01/2017.
References
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