Photographic Dosimetry at Total Exposure Levels Below 20 mr
- National Bureau of Standards, Washington, DC (United States)
Assemblies of commercial photographic material sandwiched between two plastic scintillators can be used to measure high-energy x- or gamma-ray exposures down to 1 mr and less. The energy dependence of the assemblies' response is much less than that of a conventional photographic dosimeter, in some instances allowing an exposure interpretation with an accuracy of plus or minus 25 percent over the energy range from about 1.1 Mev to 1.25 Mev. However, low- intensity reciprocity failure limits the range of applicability of the system. Conventional photographic dosimeters, not incorporating scintillators, are usually preferable for routine personnel dosimetry. By extending the monitoring period, it may be possible to avoid personnel dosimetry below 20 mr entirely. However, by doing this, one introduces additional difficulties because of instabilities in the photographic image. In some instances, an increase in effective emulsion thickness, achieved by using stacks of identical films, may lead to an increase in emulsion sensitivity sufficient to extend the useful range of a film badge well below 2U mr, without the use of a scintillator.
- Research Organization:
- National Bureau of Standards, Washington, DC (United States)
- Sponsoring Organization:
- US Department of Commerce; US Atomic Energy Commission (AEC)
- NSA Number:
- NSA-14-011831
- OSTI ID:
- 4173380
- Report Number(s):
- NBS-TN--29; PB-151388
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ABSORPTION
DOSEMETERS
EFFICIENCY
ENERGY
ENERGY RANGE
ERRORS
FILM BADGES
GAMMA RADIATION
HEALTH AND SAFETY INCLUDING DOSIMETRY
IMAGES
MEASURED VALUES
MONITORING
NUCLEAR EMULSIONS
PERSONNEL
PHOSPHORS
PHOTOGRAPHIC FILM
RADIATION DOSES
SENSITIVITY
STABILITY
THICKNESS
X RADIATION