IMPROVED METHOD FOR PERSONAL PHOTOMONITORING OF GAMMA HAZARD (IFK-11)
The existing method of monitoring gamma-radiation with photofilm has disadvantages due to the following factors: results depend on radiation energy; sensitivity is low; measurement of the degree of blackening by a densitometer is subjective. Steps to overcome these disadvantages are considered. The photofilm is most sensitive to soft gamma radiation. To compensate for this, filters are used that comprise a layer of lead and a layer of aluminum. Lead ensures greater absorption of soft gamma radiation, while aluminum protects the emulsion against secondary electrons knocked out of lead. To increase sensitivity, the compensating filters are used in combination with intensifying screens prepared from calcium tungstate. the optimum thickness of a lead filter with an intensifying screen is 1.5 to 1.6 mm; without the screen, 0.75 to 0.8 mm. The thickness of the aluminum layer is 0.5 mm. A compensationtype photometric scheme with selenium phototubes was used for objective evaluation of blackening. (TCO)
- Research Organization:
- Originating Research Org. not identified
- NSA Number:
- NSA-13-022301
- OSTI ID:
- 4227984
- Journal Information:
- Issledovaniya v Oblasti Dozimetrii Ioniziruyushchikh Izluchenii Sbornik Statei, Journal Name: Issledovaniya v Oblasti Dozimetrii Ioniziruyushchikh Izluchenii Sbornik Statei
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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