Summary
The decay curves of storedAitken nuclei as measured with a photo-electric nucleus counter exhibit small non-random divergencies from the theoretical pattern for these curves. Investigations of these anomalies reveal that their origin is to be found in the counter itself. This is shown to be due to a gradual drying out of the counter, together with a possible cooling due to frequent use. Suggestions for the use of the counter which should eliminate these peculiarities in behaviour are put forward.
Zusammenfassung
Die mit einem photoelekrischen Kernzähler gemessenen Zerfallkurven gespeicherterAitken-Kerne lassen kleine überzufällige Abweichungen vom theoretischen Verlauf solcher Kurven erkennen. Die Untersuchung dieser Abweichungen führt zu der Feststellung, daß ihr Ursprung im Zähler selbst zu suchen ist, und zwar wird gezeigt, daß dies der allmählichen Austrocknung des Zählers zusammen mit einer möglichen Abkühlung infolge häufiger Benützung zuzuschreiben ist. Es werden Vorschläge gemacht, wie bei der Benützung des Zählers diese Störungen vermieden werden können.
Résumé
Les courbes de décomposition de noyaux d'Aitken conservés, courbes mesurées au moyen d'un compteur photoélectrique de noyaux, montrent de petites disparités dépassant la répartition normale d'avec celles déterminées théoriquement. L'étude de ces divergences conduit à la constatation qu'il faut en rechercher l'origine dans le compteur lui-même. On démontre ainsi que ces différences sont imputables à un désèchement progressif de l'appareil accompagné d'un refroidissement dû à un usage fréquent. On fait des propositions permettant d'éviter de tels défauts lors de l'usage d'un tel compteur de noyaux.
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References
Nolan, J. J., andV. H. Guerrini: The Diffusion Coefficients and Veloities of Fall in Air of Atmospheric Condensation Nuclei. Proc. Roy. Irish Acad.43A, 5–24 (1935).
Nolan, J. J., andP. J. Nolan: Diffusion and Fall of Atmospheric Condensation Nuclei. Proc. Roy. Irish Acad.45A, 47–63 (1938).
Nolan, P. J., andE. Kuffel: Coagulation and Diffusion of Enclosed Nuclei. Geofis. pura appl.31, 97–106 (1955).
O'Connor, T. C.: Some Characteristics of Condensation Nuclei Stored in a Large Vessel. Geofis. pura appl.31, 107–114 (1955).
McGreevy, G.: Time Variation of the Size-Distribution of Stored Condensation Nuclei. Arch. Met. Geoph. Biokl. A14, 37–54 (1964).
Pollak, L. W., andT. C. O'Connor: The Uncertainties in Measurements of Concentration of Condensation Nuclei with Photo-electric Counters and the Decay of Nuclei in Large Vessels. Int. Assoc. Meteorol. U. G. G. I. Scienet. Proc. 369–373, Rome, 1954.
Pollak, L. W., andT. C. O'Connor: Decay of Aerosols in Small and Very Small Vessels and a Static Method for Determining the Size of Condensation Nuclei. Geofis. pura appl.31, 66–79 (1955).
Rich, T. A., L. W. Pollak andA. L. Metnieks: On the Time Required for Aerosols to Reach Electrical Equilibrium. Geofis. pura appl.51, 217–224 (1962).
Pollak, L. W. andA. L. Metnieks: The Approach to Charge Equilibrium in a Stored Aerosol during Aging. Geofis. pura appl.51, 225–236 (1962).
Flanagan, V. P. V., andT. C. O'Connor: Ionization Equilibrium in Aerosols. Geofis. pura appl.50, 148–154 (1961).
Nolan, P. J., andL. W. Pollak: The Calibration of a Photo-electric Nucleus Counter. Proc. Roy. Irish Acad.51A, 9–31 (1946).
Metnieks, A. L., andL. W. Pollak: Instruction for Use of Photoelectric Condensation Nucleus Counters. Geophys., Bull. No. 16, School of Cosmic Physics, Dublin, 1959.
Pollak, L. W., andA. L. Metnieks: On the Determination of the Diffusion Coefficient of Heterogeneous Aerosols by the Dynamic Method. Geofis. pura appl.37, 183–190 (1957).
Metnieks, A. L., andL. W. Pollak: On the Particle Size Analysis of Polydisperse Aerosols Using a Diffusion Battery and the Exhaustion Method. Geophys. Bull. No. 21, School of Cosmic Physics, Dublin, 1962.
McGreevy, G.: The Size Spectrum of Condensation Nuclei by a New Form of the Ionic Mobility Method. Arch. Met. Geophys. Biokl. A14, 318–342 (1965).
Murphy, T.: The Formation and Disappearance of Fog in Photo-electric Nucleus Counters. Geofis. pura appl.36, 35–40 (1957).
Pollak, L. W., andT. Murphy: Comparison of Photo-electric Nucleus Counters. Geofis. pura appl.25, 44–60 (1953).
Pollak, L. W., andT. C. O'Connor: A Photo-electric Condensation Nucleus Counter of High Precision. Geofis. pura appl.32, 139–146 (1955).
Pollak, L. W., andL. W. Metnieks: The Fog in the Photo-electric Nucleus Counter. Geofis. pura appl.38, 181–203 (1957).
Pollak, L. W., T. C. O'Connor, andL. W. Metnieks: On the Determination of the Diffusion Coefficient of Condensation Nuclei Using the Static and Dynamic Methods. Geofis. pura appl.34, 177–195 (1956).
Pollak, L. W., andA. L. Metnieks: New Calibration of Photo-electric Nucleus Counters. Geofis. pura appl.43, 285–301 (1959).
Ohta, S.: Investigation on the Formation and Disapperance of Fog in an Expansion Fog Chamber. Geophys. Mag. Tokyo29, 229–287 (1958).
Pollak, L. W., andA. L. Metnieks: The Influence of Pressure and Temperature on the Counting of Condensation Nuclei. Part I: Influence of Pressure. Geofis. pura appl.47, 123–141 (1960).
Gotsch, G.: Untersuchungen zum Problem der Aktivität kleiner Kondensationskerne. Arch. Met. Geoph. Biokl. A13, 73–116 (1963).
Pollak, L. W., andA. L. Metnieks: The Influence of Pressure and Temperature on the Counting of Condensation Nuclei. Part II: Influence of Low Temperature. Geofis. pura appl.50, 7–22 (1961).
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McGreevy, G. Anomalies in measurements made with a Pollak-Nolan photo-electric nucleus counter. Arch. Met. Geoph. Biokl. A. 15, 90–108 (1965). https://doi.org/10.1007/BF02247792
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DOI: https://doi.org/10.1007/BF02247792