THE DEVELOPMENT, DESIGN, AND FABRICATION OF SEMIRAD DOSIMETER AND CHARGER.
Technical rept. 1 Nov 63-31 May 66,
BENDIX CORP CINCINNATI OH
Pagination or Media Count:
This report describes the preliminary investigation, the design and development, and the building and testing of final prototypes of 1 a semirad, quartz-fiber, self-indicating pocket dosimeter for gamma and fast neutron radiation and 2 a special charger to be used with this dosimeter. For fast neutron response this dosimeter requires using a hydrogenous plastic such as polyethylene in a sealed-off vacuum enclosure at 5 x 0.00001 mm Hg. This dosimeter operates by collecting low-energy secondary electrons in a vacuum and does not saturate at dose rates in excess of 10 to the 8th power radsec of mixed neutron and gamma radiation. The final dosimeter design used radiation crosslinked polyethylene in a vacuum enclosure and an internal ion pump to improve the vacuum when needed. Essentially equal response of the dosimeter to fast neutron or gamma radiation on a rad basis has been obtained. The range is 0 to 600 rad and calibration accuracy is plus or minus 10 percent. Electrical leakage is less than 1-12 percent per day at 130 F. Operating temperature range is -65 F to 140 F. This is a tactical dosimeter suitable for use in the field. The size is 58 in. diameter by 4-78 in. long. Author