Development of a simple neutron irradiation facility with variable average energy using a light water moderated 241AmBe source

The energy spectra of a 37 TBq (1.0 Ci) 241AmBe neutron source, immersed in cylindrical water filled polyethylene jars of different radii were unfolded using multiple Bonner spheres. The use of this facility for the calibration exposure of LiF thermoluminescence dosimeters and neutron monitors with fast neutrons of various average energies has been suggested.