The range of the out-of-core Campbell system is < 1 x 10^ to 1 x 101^ nv (see Figure 8-21).

Gamma may limit the minimum measurable neutron flux in some applications. The detector can

be used to 300°C, and is limited because it is made with aluminum. A titanium detector of

similar design could be used; it would operate up to 1000°F (tested) and beyond (untested). The 19

specified life is 10 nvt. The same Campbell channel electronics is used as in the in-core system, with the exception of the polarizing voltage supply (the larger detector requires higher voltage).

■v I

APPENDIX