ML20099G267
| ML20099G267 | |
| Person / Time | |
|---|---|
| Site: | Limerick  |
| Issue date: | 06/19/1984 |
| From: | ENVIRONMENTAL PROTECTION AGENCY |
| To: | |
| References | |
| OL-A-159, NUDOCS 8411270194 | |
| Download: ML20099G267 (2) | |
Text
3 RADIOLOGICAL QUALITY OF
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To determine worldwide deposition, HASL assumes that within the 10 degree latitude band, that HASL sampling sites, on the average, areHence, multiplyin
.y representative of fallout in that area.90Sr deposition (mci /km ) by the area of th 2
2 For poleward areas h ond 80 N monthly gives the total deposition in that band.S, values of deposition a
'oothly and 70 decreasing 90Sr deposition to zero at the poles.
deposition in each latitude band yields the total worldwide deposition.
The total deposition of 90Sr fallout on the earth's surface in 1973 w found to be 63 kCf.
The seasonal and latitudinal variations in fallout have remained 19S8.
as before (4.1).
Table 4-1 and figures 4-1 and 4-2 show the annual cumulative world-90Sr deposition and cumulative 90Sr depo-wide 90Sr deposition, monthlyFrom these tables and figures, it is evident that sition since 1958.
the total 90Sr burden is decreasing as radioactive decay exceeds fallout.
Strontium-?G ir. diet Estimates of intake via the total diet in New York City and San Francisco have b en made since 1960 based upon concentrations found in The dietary intakes of 30Sr have decreased from quarterly food samples.
maximum levels attained in 1963-64, but the decline has become more gradual in recent years due to the continuing small amounts of 90Sr The deposition and the little changing cumulative deposit in th 9
The 1973 estimate of intake for San Fran-percent decrease from 1972.
Lower intakes cisco was 3.2 pCi/ day compared to 3.6 pCi/ day in 1972.
occurred in San Francisco due to the fact that less deposition occurs in i
the San Francisco food-producing region (4.2).
Table 4-2 shows 90Sr concentrations found in the diet for some 19
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food products in San Francisco and New York City.
Figure 4-3 shows the trend in 90Sr concentration in these cities since 1960. The rapid 1963-1964 became more gradual after 1966-decline in 90Sr intakds after 67 as the uptake from the little changing cumulative deposit of 90Sr on 90Sr concentrations in soil became the dominant factor contributing to food (4. 2).
Resumption of atmospheric testing by the French and Chinese in 1966, resulting in a relatively constant low fallout rate of 90Sr, has been a factor in maintaining the dietary intakes of 90Sr at about constant levels since 1968.
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