RAINOUT RELATIONS ON SAMPLING NETWORKS
o21
made for eight storms. These included cases of (1) thunderstorms,
rainshowers, and steady rain and (2) storms of various rainfall volume,
intensity, and duration. Results were similar to those obtained in
1963. In all storms a relatively strong association was indicated between the patterns of beta deposition and storm rainfall with high and
low centers of deposition lying near corresponding high and low centers
of rainfall. The association between patterns of beta concentration and
storm rainfall was relatively strong in six of the eight storms but was
similar to the association observed ‘n 1963; the association between
high and low centers was not consistent. Generally, high beta concentrations corresponded with light rainfall amounts, but exceptions were
even more frequent than in 1963; that is, it was not uncommonto find
high beta concentrations located near areas of high rainfall amounts.
In summary, pattern comparisons among beta concentration, beta
deposition,
and
storm rainfall on several networks in 1962-1964
indicate a generally strong association between patterns of deposition
and rainfall if allowance is made for small displacement in the location
of corresponding high and low centers. The causes of these displacements can be only hypothesized at this time. The correspondence between beta concentration and rainfall patterns is better than correlation
of these two factors at a given point indicates, but the relation is not
strong enough to permit the use of storm rainfall as a single predictor
of beta-concentration patterns. Close association was found frequently
enough, however, to indicate that rainfall volume has a strong influence
on the beta-concentration pattern and that it should be studied further
in conjunction with other meteorological factors that may help define
the rainout patterns.
REFERENCES
1, F. A. Huff, Study of Rainout of Radioactivity in Wlinois, Second Progress Report to Atomic Energy Commission, Contract AT(11-1)-1199, Illinois State
Water Survey, January 1964.
2. R. L. Weatherford, Preparation of Samples for Radioactivity Counting, in
Proceedings of the Second Sanitary Engineering Conference, Radiological
Aspects of Water Supplies, University of Illinois Engineering Experiment
Station Circular No. 69, January 1960.
3. A. Walton and Ralph E. Fried, Studies of Nuclear Debris in Precipitation,
Seventh Progress Report to Atomic Energy Commission, Contract AT(30-1)2415, Isotopes, Inc., August 1961.
4, A, Walton, Micah W. M. Leo, and Colin Sanderson, Study of Rainout of Radioactivity in Illinois, Annual Report to Illinois State Water Survey, Contract
AT(11-1)-1199, Isotopes, Inc., February 1963.
5. V. Conrad and L. W. Pollak, Methods in Climatology, pp. 54-55, Harvard
University Press, Cambridge, Mass., 1950.
6. F. A. Huff and J. C. Neill, Rainfall Relations on Small Areas in Llinois,
Illinois State Water Surv. Bull:, 44, 1957.
7. U. S. Weather Bureau, Thunderstorm Rainfall, Hydrometeorological Report
No. 5, Washington, D. C., 1947.
CDK