Radioecological Studies of the Hudson River Page: 15
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The activity per unit area of Cs-137, Cs-134, Mn-54, Co-60 and
Co-58 estimated in all core samples taken during 1973 are
summarized in Table 14.
Accumulations of Cs-137, which is introduced to the estuary
both from reactor releases and fallout, were higher than for any
of the other man-made gamma emitters. The highest cumulative
Cs-137 activity (652 mCi/km2) occurred at Con Hook, a site of
particularly high sediment deposition. Cs-134 accumulations
ranged between 16 and 46 percent of those for Cs-137. Since
1969, the ratio of the two cesium isotopes (134/137) in liquid
waste from Indian Point Unit # 1 has consistently ranged between
0.6 and 1.0. The lower ratios observed in sediment deposits
at this time are related both to decay of 134Cs (T1/2 = 2.05 yrs),
and to the presence of 137Cs from fallout. Although no
accumulation of 134Cs or 54Mn was detected at the George
Washington Bridge, 60Co was found to be present.
On'.y.very small accumulations of reactor released radio-
nuclides were detected on the shore at Verplanck Beach (Table 14).
Cores were collected at the high tide line and 5-6 feet above
and below that point. A general decrease in accumulations of
detectable radionuclides was observed in the shoreward direction.
A comparison of the cumulative activities of radionuclides
determined at all sampling sites between 1971 and 1973 appears
in Tables 15 and 16. Following the relatively high 1971
releases from Indian Point, manganese-54 accumulations in- 15 -
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New York University. Medical Center. Institute of Environmental Medicine. Radioecological Studies of the Hudson River, book, 1973; New York. (https://digital.library.unt.edu/ark:/67531/metadc29392/m1/19/: accessed April 19, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; .