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  • 1
    Electronic Resource
    Electronic Resource
    Radon emanometry in soil gases and activity in ashes from El Chichon Volcano (1985)
    Springer
    Pure and applied geophysics 123 (1985), S. 407-421 
    Details
    ISSN: 1420-9136
    Keywords: Radon in volcanoes ; Environmental radon monitoring ; Alpha tracks
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Radon (222Em) emanation measurements in soil gases are reported in connection with the 1982 eruptions of El Chichón Volcano.222Em detection is performed with LR-115 cellulose nitrate track detectors. Results show a general decreasing pattern of222Em concentration in soil with time after the eruptions. Activity measurements of radon daughters in ashes show that a large amount of222Em and220Em was released from magma degassing during the eruptions, and that only a fraction of the degassed magma was erupted. An important fluid interaction between the magma chamber and the surrounding sedimentary rock is also suggested.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00880740
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Radon in soil anomaly observed at Los Azufres geothermal field, Michoacan: a possible precursor of the 1985 Mexico earthquake (Ms = 8.1) (1989)
    Springer
    Natural hazards 1 (1989), S. 319-329 
    Details
    ISSN: 1573-0840
    Keywords: Earthquake precursors ; radon anomaly ; α track detectors
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geography , Geosciences
    Notes: Abstract A radon anomaly in a nuclear track detector placed on a fault was detected prior to the destructive (Ms = 8.1) Mexican earthquake of 19 September 1985. The fault is a structural feature of the geothermal field ‘Los Azufres’, 260 km NE of the epicentral area. Since no other phenomenon can be found as a possible cause for the radon anomaly, it is proposed that preseismic regional stress perturbations may produce changes in the fluid transport patterns at the fault, suggesting that radon measurements in similar conditions could provide a good precursor in high seismic risk areas.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00134830
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Variations of radon in soils induced by external factors (1987)
    Springer
    Journal of radioanalytical and nuclear chemistry 119 (1987), S. 199-209 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Experiments were designed to evaluate, in a controlled way, some of the variations that can be expected in radon concentration in soil due mainly to meteorological factors and to close spacing monitoring in the field. Electronic continuous radon monitoring and the track-etch method were used to record the radon α-decay. The radon emanation in daily measurements and in long term surveys showed a general effect modulated by temperature and pressure variations. Radon monitoring in soil for nearby stations showed that a 10% range of variation can be expected with the track-etch method and as a result of non-homogeneous emanation pattern of the soil.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02162265
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    Paper (German National Licenses)
    Fulltext
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