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  • 1995-1999  (9)
  • 1996  (9)
Datenquelle
Materialart
Erscheinungszeitraum
  • 1995-1999  (9)
Jahr
  • 1
    Digitale Medien
    Digitale Medien
    Childhood leukemia in Belarus before and after the Chernobyl accident (1996)
    Springer
    Radiation and environmental biophysics 35 (1996), S. 75-80 
    Details
    ISSN: 1432-2099
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Physik
    Notizen: Abstract Childhood leukemia (ICD 204–208 [1]) incidence rates in the different regions of Belarus are reported for a period before and after the Chernobyl accident (1982–1994). There are, at this point, no recognizable trends towards higher rates.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02434028
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Generalization of the variance-covariance method for microdosimetric measurements (1996)
    Springer
    Radiation and environmental biophysics 35 (1996), S. 111-115 
    Details
    ISSN: 1432-2099
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Physik
    Notizen: Abstract   The variance method of microdosimetric measurements and its extension, the variance-covariance method, permit the determination of an essential parameter of radiation quality, the dose mean event size, y d . The methods have – among other advantages – the feature that they permit measurements for smaller simulated sites than the conventional single-event technique. It is, therefore, desirable to employ them also for the determination of further moments of the distribution of y. The formulae for the first three moments are here derived both for the case of constant dose rate and of fluctuating dose rates. A second article will use the same mathematical approach to deduce formulae that remain valid even if there are slow changes of the ratio of dose rates in the two detectors for the variance-covariance method. A third article will explore – in terms of microdosimetric data – the applicability of the formulae.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s004110050017
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Analysis of chromosome aberrations in human peripheral lymphocytes induced by in vitro α-particle irradiation (1996)
    Springer
    Radiation and environmental biophysics 35 (1996), S. 179-184 
    Details
    ISSN: 1432-2099
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Physik
    Notizen: Abstract Irradiation of human lymphocytes by α-particles under different conditions has been seen to be substantially more effective in the induction of dicentric chromosomes than irradiation by γ-rays. However, the relative biological effectiveness (RBE) determined in these studies differed by a factor of more than 10. These variations in RBE are likely to be due in part to differing exposure conditions. Therefore, a technique designed to insure uniformity of irradiation was developed in the present study, and complications due to the cell cycle kinetics were controlled. After stimulation with phytohaemagglutinin (PHA), separated lymphocytes were allowed to attach for 3 h to the thin foil bottom of an irradiation chamber. Cell monolayers were exposed with α-particles from 241Am. Strong over-dispersion was noted for the cell-to-cell variance of the number of dicentrics. The dose response of dicentrics was linear, with a yield of 0.27 dicentrics per cell and per Gy. This corresponds to a low dose RBE of 15 relative to 137Cs γ-ray exposure under the same experimental conditions.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    Generalization of the variance-covariance method for microdosimetric measurements (1996)
    Springer
    Radiation and environmental biophysics 35 (1996), S. 111-115 
    Details
    ISSN: 1432-2099
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Physik
    Notizen: Abstract The variance method of microdosimetric measurements and its extension, the variance-covariance method, permit the determination of an essential parameter of radiation quality, the dose mean event size,y d. The methods have — among other advantages — the feature that they permit measurements for smaller simulated sites than the conventional single-event technique. It is, therefore, desirable to employ them also for the determination of further moments of the distribution ofy. The formulae for the first three moments are here derived both for the case of constant dose rate and of fluctuating dose rates. A second article will use the same mathematical approach to deduce formulae that remain valid even if there are slow changes of the ratio of dose rates in the two detectors for the variance-covariance method. A third article will explore — in terms of microdosimetric data — the applicability of the formulae.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02434033
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 5
    Digitale Medien
    Digitale Medien
    Childhood leukemia in Belarus before and after the Chernobyl accident (1996)
    Springer
    Radiation and environmental biophysics 35 (1996), S. 75-80 
    Details
    ISSN: 1432-2099
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Physik
    Notizen: Abstract   Childhood leukemia (ICD 204–208 [1]) incidence rates in the different regions of Belarus are reported for a period before and after the Chernobyl accident (1982–1994). There are, at this point, no recognizable trends towards higher rates.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/PL00007677
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 6
    Digitale Medien
    Digitale Medien
    Generalization of the variance-covariance method for microdosimetric measurements (1996)
    Springer
    Radiation and environmental biophysics 35 (1996), S. 145-152 
    Details
    ISSN: 1432-2099
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Physik
    Notizen: Abstract Numerical simulations in terms of microdosimetric data for 5-MeV neutrons are utilized to test the twin detector method of microdosimetric measurements in its new, extended form. Three different conditions of measurement are considered: (I) constant dose increments per measurement, (II) fluctuating dose increments per measurement, and (III) fluctuating dose increments combined with slow changes of the dose-rate ratio for the two detectors. Under each of the conditions, large numbers of measurement series are simulated, and the estimation formulae for the mean and the two subsequent moments of the dose-weighted single-event distribution, d(y), are applied. The estimation formulae exist in three different forms: uncorrected formulae that apply to condition I, corrected formulae that are valid also for condition II, and fully corrected formulae that remain applicable under condition III. The results of the simulations indicate the acceptable ranges of doses per measurement interval. It can be seen that all three parameters are obtainable through the twin detector method, and that the fully corrected formulae for the two lower moments are generally applicable. The determination of the third moment is possible only under limited conditions, and the fully corrected formula is not useful in this case, while the corrected formula has some applicability even under condition III.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s004110050023
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 7
    Digitale Medien
    Digitale Medien
    Editorial (1996)
    Springer
    Radiation and environmental biophysics 35 (1996), S. 63-64 
    Details
    ISSN: 1432-2099
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02434026
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  • 8
    Digitale Medien
    Digitale Medien
    Generalization of the variance-covariance method for microdosimetric measurements (1996)
    Springer
    Radiation and environmental biophysics 35 (1996), S. 117-119 
    Details
    ISSN: 1432-2099
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Physik
    Notizen: Abstract The variance method of microdosimetric measurements has been used to obtain the dose average event size,y d, of a radiation from a series of repeated measurements at equal doses. Since it is not always possible to repeat the same dose in multiple measurements, a generalization, the variance-covariance method, has supplanted the carlier technique. It utilizes a pair of synchronized detectors and permits the derivation ofy d from a series of measurements with doses that are allowed to fluctuate. In the preceding article, the two methods were extended to permit also the derivation of the second and third moments,y 2 andy 3, of the event sizes. The present communication carries the extension further by deriving formulae that remain valid when the ratio of the doses in the two detectors is subject to slow changes; this extends the applicability of the twin detector method to situations in which the detector system moves in a nonuniform field, or in which there is movement of shielding or scattering material near the detectors.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02434034
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 9
    Digitale Medien
    Digitale Medien
    Generalization of the variance-covariance method for microdosimetric measurements (1996)
    Springer
    Radiation and environmental biophysics 35 (1996), S. 117-119 
    Details
    ISSN: 1432-2099
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Physik
    Notizen: Abstract   The variance method of microdosimetric measurements has been used to obtain the dose average event size, y d , of a radiation from a series of repeated measurements at equal doses. Since it is not always possible to repeat the same dose in multiple measurements, a generalization, the variance – covariance method, has supplanted the earlier technique. It utilizes a pair of synchronized detectors and permits the derivation of y d from a series of measurements with doses that are allowed to fluctuate. In the preceding article, the two methods were extended to permit also the derivation of the second and third moments, y 2 and y 3, of the event sizes. The present communication carries the extension further by deriving formulae that remain valid when the ratio of the doses in the two detectors is subject to slow changes; this extends the applicability of the twin detector method to situations in which the detector system moves in a nonuniform field, or in which there is movement of shielding or scattering material near the detectors.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s004110050018
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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