Preliminary Studies for a High Energy Neutron Area Monitor

Etched track detectors were exposed to neutrons produced by a spallation target struck by a beam of 800 MeV protons. The fields were filtered by 0, 10, and 40 cm of polyethylene. The etched track dosemeters were exposed on a polyethylene phantom. The dosemeters were exposed bare and behind lead filters of 0.25, 0.50, 0.75, 1.00, 1.25 and 1.50 cm of lead with the face of the dosemeter perpendicular to the beam, and bare and behind lead filters of 0.50, 1.0, and 1.5 cm of lead with angles of incidence 45( and 75(. Monte Carlo calculations of these experimental configurations were done using MCNP and LAHET with input from the calculated spectra. These results are compared with the experimental results to understand the basic processes involved in the production of tracks with high energy neutrons and to develop a high energy neutron area monitor.