AERIAL PROSPECTING OF URANIUM ORES IN WOODED REGIONS (in Russian)
Although trees absorb part of the radiation emitted by the soil, the biomass may be itself an emitter as the aboveground portion of the plants may contain Ra. Ashes of the branches of birch, fir, spruce, larch, and other trees may contain 1.5 to 3 times more Ra than the ground. Such abnormally high Ra concentrations in the above-ground portions of trees growing in U-bearing soil may thus create gamma anomalies'' of 0.4 to 0.9 mu C/hr at a height of 40to 50 m above the ground. For calculation, the forest areas are divided in 3 horizontal layers: the crest, the trunks, and the dead ground cover. Equations were derived for determining the dose rate attributable to these layers. Three factors affect the aerial logging: specific geophysical processes, noted especially in acid forest soils, which tend to deplete the U minerals at a depth from 0.5 to 1 m; absorption of Ra in the above-ground portions of the vegetation, creating biochemical anomalies; and absorption of the gamma radiation, emitted by the soil, by the vegetation. (TTT)
- Research Organization:
- Originating Research Org. not identified
- NSA Number:
- NSA-18-008515
- OSTI ID:
- 4098218
- Journal Information:
- At. Energ. (USSR), Vol. Vol: 15; Other Information: Orig. Receipt Date: 31-DEC-64
- Country of Publication:
- Country unknown/Code not available
- Language:
- Russian
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