Prediction of Future Levels of Long-Lived Fission Products in Milk

Bartlett, B. O.; Russell, R. A.

doi:10.1038/2091062a0

Cited by 10 publications

(5 citation statements)

References 3 publications

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“…Comparing Curves B and C, we may infer that Pool S contributed approximately 2.5, 3.5 and 6.4 percent of the total 137 Cs during 1964, 1965 and 1966. These estimates are consistent with approximate values of 2, 3 and 7 percent which may be deduced from the analysis of Bartlett and Russell,14 representing the contributions to 137 Cs in milk during these years from activity assumed to be bound in soil. Curves B and C also suggest that in recent years Pool S has been responsible for ~50 percent of the activity in our subjects, and the estimate is very similar if derived using Set 3.…”

Section: Discussionmentioning

confidence: 53%

“…This corresponds to a working assumption made by Bartlett and Russell,[14][15] in deriving empirical relationships between deposition of 137 Cs in fallout and ensuing concentrations in milk. These relationships contained a term proportional to the cumulative deposit, the constant of proportionality being referred to as the "soil factor" because the pool was assumed to consist of activity which was firmly bound in the soil and was consequently incorporated into vegetation by root uptake only very slowly.…”

Section: Significance Of the Half-lives T S And T Fmentioning

confidence: 94%

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The caesium‐137 content of man related to fallout in rain, 1957–76

Newton¹,

Eagle²,

Venn³

1977

International Journal of Environmental Studies

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Amounts of 137 Cs in residents of Central Southern England were smaller during 1974-76 than at any time during the previous 17 years, and 17 times lower than those recorded during 1964-65. A simple model has been developed, empirically relating 137 Cs in rainfall during 1957-76 to the ensuing burdens in man, and the results suggest that a slowly-declining reservoir of deposited material from the weapons tests of 1955-63 currently contributes as much dietary contamination as the low levels of recent fall out. 137 Cs burdens are therefore unlikely to decline by more than a factor of 2-3 during the next decade, even in the absence of additional weapons tests. The radiation dose rate from the current (early 1977) average level of 137 Cs in these subjects is however only one percent of that delivered by the body's natural 40 K.

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Section: Discussionmentioning

confidence: 53%

Section: Significance Of the Half-lives T S And T Fmentioning

confidence: 94%

The caesium‐137 content of man related to fallout in rain, 1957–76

Newton¹,

Eagle²,

Venn³

1977

International Journal of Environmental Studies

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“…The purpose was furthermore to obtain more reliable estimates of the soil factors in equations (1) and (2) than hitherto and especially to C , = aF, + cFl + bF, (2) 297 PREDICTION MODELS FOR AND 137Cs LEVELS investigate whether 137Cs revealed any soil factors during the increase in importance of indirect contamination (soil uptake).…”

Section: Introductionmentioning

confidence: 99%

Prediction Models for Strontium-90 and Caesium-137 Levels in the Human Food Chain

Aarkrog¹

1971

Health Physics

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Milk, rye, barley, wheat, oats, potatoes, cabbage, carrots, beef, pork and total diet have been collected all over Denmark since the 1961-62 test series and analysed for 90Sr and 137Cs. A.long with the performance of diet measurements, precipitation, soil and air samples were collected and analysed for 90Sr. The diet levels were related to the fall-out data by a least squares analysis. It was not essential whether concentrations in air (or precipitation) or (deposited activity were used in the "rate" and "lag" terms, although the deposition data tlmded to give the best models. Strontium-90 determinations in human bone and whole-body 13'Cs measurements were performed for the same period as the diet measurements. Quantitative models of the transfer of QOSr and 13'Cs to man were calculated in analogy with the equations used for diet OR bone/diet was calculated from the soil factors in the equations. The prediction models were transformed to exponential equations, which served for the calculation of the dose commitments to the Danish population.

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“…A RELATIONSHIP between the radioactive contamination of milk, the rate of fallout and the deposit on soil has been suggested by Tajima ' . C=prFr+pdFd, in which C is the mean annual contamination of milk (pCi 9 0 Sr/g Ca), Fr is the annual deposit (mCi 90Sr/km 2 ), Fd is the cumulative deposit of 90Sr (mCi 9 0 Sr/km 2 ) and pr, pd are the proportionality factors related respectively to Fr and Fd.…”

mentioning

confidence: 99%

“…In the United Kingdom, the data provided from an extensive country-wide survey led Bartlett et af. 2 to introduce a third term into this equation, which becomes C=prFr+pIFI+ pdFd where FI is the deposit in the last half of the previous year and pi is the "lag-rate" factor. As Stievenart et al 3 emphasize, the numerical values of proportionality factors mentioned in the literature are very disparate and hardly comparable, because of the choice of the different periods.…”

mentioning

confidence: 99%