Fast neutron damage to HPGe Detector

A decrease in the energy resolution of a large HPGe was first seen after the irradiation of $5\times 10^7 n/cm^2$<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 $5\times 10^6 n/cm^2$ 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 $n_{rate}\frac{1}{4\pi d^2}$

References

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