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  • 1990-1994  (5)
Source
Material
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Tritium concentrations of river water on northern and southern islands of Japan (1991)
    Springer
    Journal of radioanalytical and nuclear chemistry 150 (1991), S. 163-169 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Tritium concentrations were measured for river waters on two islands in Japan. Significant difference was observed on the distribution of tritium concentrations on both islands, the river water samples from the northern island had higher concentrations and the average was about twice compared to that from the southern island. Higher tritium concentration in precipitation and the larger area of the northern island would be responsible for higher tritium concentrations in river waters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02041499
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Loss of99Tc from seaweeds in the course of dry ashing (1991)
    Springer
    Journal of radioanalytical and nuclear chemistry 155 (1991), S. 335-342 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Loss of99Tc in seaweed during dry ashing has been investigated. Two kinds of brown seaweeds labeled with99Tc were ashed for 24 or 48 h at 400, 450 and 500 °C, showing no correlation between the loss of99Tc and species, temperature and time of ashing. The averaged recovery of99Tc was 91.0±4.0%, indicating that most of the99Tc in the seaweed was retained within the matrix of the ash which was obtained under general conditions of ashing.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02163880
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Determination of14C in environmental materials: Combination of CO2 absorbent and a large-volume low-background liquid-scintillation counter (1993)
    Springer
    Journal of radioanalytical and nuclear chemistry 173 (1993), S. 323-329 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Commerically available CO2 absorbent and its scintillator were used to determine14C in environmental materials. Absorption of CO2 by the CO2 absorbent was quantitative, and strong and stable fixation was confirmed by no release of CO2 from the CO2 absorbent for a long period after absorption. The14C activity was measured by a large-volume low-background liquid-scintillation counter and the counts were quite stable for two weeks. Counting efficiency and background counts varied with the amounts of CO2 absorbed, indicating a change of quenching level with absorption of CO2. The different quenching levels were, however, normalized with external standard channel ratio (ESCR). Specific activity of14C in the present shell was evaluated for samples with different amounts of CO2 absorbed and were consistent with each other within the counting error, suggesting validity of the present method. Contemporary14C level in the environmental materials, 95% CO2 saturated sample, could be measured with 4% counting error (2σ) by 1000 min counting time.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02043034
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Simultaneous determination of210Bi and210Po on pine needles by solvent extraction and liquid scintillation counting (1994)
    Springer
    Journal of radioanalytical and nuclear chemistry 177 (1994), S. 219-228 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract A determination procedure has been developed for210Bi and210Po in environmental samples and was applied for pine needles. Bismuth-210 and210Po separated from the parent nuclide210Pb as BiOCl precipitate were extracted simultaneously by TOPO/toluene containing PPO and POPOP. The separation of210Bi and210Po from210Pb was almost satisfactory. The activity of210Bi+210Po in the TOPO/toluene was measured periodically by liquid scintillation counting for about 20 days after separation. The time course of the decreasing pattern of the activity was determined by the initial activity ratio210Po/210Bi. The decreasing pattern of the activity was compared with theoretical patterns, and best estimates for210Po and210Bi were obtained by non-linear least-squares fitting. The activities of210Bi and210Po were determined for one-year and two-year old pine needles fro the same pine tree, and weathering half-time and deposition rate of these nuclides was discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02061118
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Determination of technetium-99 from the aspect of environmental radioactivity (1990)
    Springer
    Journal of radioanalytical and nuclear chemistry 140 (1990), S. 57-73 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract A radioanalytical procedure has been developed for the determination of99Tc in environmental samples. The procedure consists of precipitation, solvent extraction, ion exchange, electrodeposition and radiation measurement. Rhenium was used as a non-isotopic carrier of99Tc. On the basis of 3σ counting error, the detection limits were 4.9·10−5 Bq/l, 7.4·10−3 Bq/kg wet and 7.4·10−2 Bq/kg dry for water, biota and soil samples, respectively. Sea water, seaweeds (brown algae) and soils were collected to evaluate the present levels of99Tc in Japan. The level of99Tc in sea water was ca. 1·10−4 Bq/l around Japan. Among the seaweeds (brown algae), Ishige okamurai showed the highest concentration of 5.8·10−2 Bq/kg wet tissue and the highest concentration factor of 583. The level of99Tc in the organic rich surface soil was ca. 1 Bq/kg dry soil in Fukuoka.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02037364
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    Paper (German National Licenses)
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