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Estimation of I¹³¹ Level in Milk (Salt Lake City Milkshed): Cabriolet Event Fired in Summer

Tewes, H. A. [Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)]

REPORT

1966 Apr 06

1996 Feb 29

Declassified

8 p.

OOL2011050

UCRL-ID-126923

Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

2019 Aug 21

2023 Oct 17

The attached graph was prepared in order to achieve a rough predictive capability for estimating I¹³¹ in milkshed milk for the case of Cabriolet fired under summer conditions (i.e., all cows grazing). The following inputs and assumptions have been used in the preparation of the figure: a) I¹³¹ concentrations measured on Palanquin for single cows were halved to approximate milkshed conditions. b) I¹³¹ concentrations resulting from complete rainout of Palanquin and Sedan cloud burdens were assumed to be a factor of ten larger than for the case of dry deposition. This roughly corresponds to complete deposit of the clouds, but without 'hot spot' formation. The calculation is roughly confirmed by dry deposition vs. rainout results observed from tower shots. c) Data from tower shots (both dry deposition and rainout) were obtained from A. Tamplin's memo of March 31, 1966 (COVV-33); however, data from only those clouds having a north-easterly trajectory were included. In order to apply tower shot data to a cratering event, it was conservatively assumed that 20% of the I¹³¹ produced in a cratering event is present in the cloud, whereas 100% of the I¹³¹ from a tower shot is in the cloud. Thus, the I¹³¹ concentrations given in COVV-33 were divided by five; to convert the desposition per square meter to concentration in milkshed milk, desposition per square meter was divided by the usual factor of six.