Cip 2 S for Ground Scattering in Neutron Detector

AS potentially hazardous neutron radiation producing devices become mure preva lest I there is a corresponding proliferation of monitoring equipment, and a concomitant need to calPbr3ie that equipment. Neutron sources are available for calibration purposes, but elaborate calibration facilities usui~lfy are not. Instead, most neutron detector calibration is performed by placing both source and detector at some heights above the ground (or floor), and at a measured distance apart (what we will call a field geometry). Such procedures are also used by larger facilities that do have calibra$kon facilities, but which occasionally need to make calibration checks in the field. Whenever calibrations are made in this manner, some account must be made for the scattered radiation arriving at the detector. Even though this phenomenon is well-under-St.Dad (cn54) , it is quite often overlooked, probably because of an alhedo term which requires looking up albedo data from graphs or tables not always available. While this correction can be quite complex, the geometry portion has been simplified somewhat by Eisenhauer (EI65) who used .the con