520
HUFF
3000
3000
Z
2000
2000 3000
1.50 1.25 1.00 0.75 0.50
(a)
(b)
Fig. 4—Areal patterns of (a) beta
concentration in picocuries per liter,
(b) total rainfall in inches, and (c)
beta deposition in picocuries per
square inch. East Central Illinois
network on July 1, 1963.
(c)
The results of the 1963 beta-pattern comparisons on the East
Central Illinois network compare favorably with those obtained for
nine storms in 1962 on the small Kaskaskia and Boneyard networks,
in which six of the nine storms showed a relatively strong association
between beta concentrations and storm-rainfall patterns.’ Also, results compare favorably with those obtained with 1962 strontium
patterns.!
During 1964 the rainwater sampling network on the East Central
Illinois network (Fig. 2) was increased from 10 to 30 total storm
samplers to verify further the results of the 1962 and 1963 pattern
comparisons. Analyses
of
beta
concentration and deposition were