These relatively higher exposures, coupled with the much larger population, probably resulted in a total population dose (person-rads) to the heretofore supposedly low fallout counties of northern Utah significantly greater than that for the supposedly high fallout areas nearer the NTS. Exposures decreased with distance from the NTS to lower than 0.2 R at Richfield and Gunnison in south central Utah, before increasing again to levels of 1 to 2 R in more » the more populous northern valleys around Provo, Salt Lake City, and Ogden.
The maximum time integrated (to infinity) free air exposure in any major population center is estimated to have been approx. The external gamma radiation exposure of the population of Utah from nuclear weapons tests carried out at the Nevada Test Site (NTS) during 1951 to 1958 has been reconstructed from measurements of residual /sup 137/Cs and /sup 239/ /sup 240/Pu in soil.
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