A SIMPLIFIED FILM DOSIMETER FOR FISSION NEUTRONS
A film dosimeter technique was developed for fast neutron monitoring of reactor personnel. The method takes advantage of the rapid build-up of thermal neutrons when fast neutrons are allowed to penetrate a hydrogenous moderator. The badge consists of a 3/4-inch thick polyethylene frontpiece that is worn on the belt against the body. A combination of silver and tin filters are matched so as to produce equal film blackening from either x or gamma rays. Fast neutron exposure is determined from film blackening under radioactive silver produced by capture of the moderated neutrons. The badge contains a sensitive gamma-ray dosimeter film together with a nuclear track emulsion. The dosimeter film serves as both a fast neutron and gammaray dosimeter. The nuclear emulsion is read whenever an overexposure is indicated or under any other conditions where a more accurate evaluation of the fast neutron dose is warranted. (auth)
- Research Organization:
- Naval Radiological Defense Lab., San Francisco
- NSA Number:
- NSA-12-009309
- OSTI ID:
- 4346818
- Report Number(s):
- USNRDL-TR-224
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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