Olympic Peninsula, Washington The series of measurements made in the northern part of the Olympic Peninsula, Washington (Clallam Co.), were of special interest since, over a distance of approxi- mately 50 miles, the mean annual rainfall varies by a factor of nearly 10 from east (Sequim) to west (Forks). Under such conditions one might expect a substantial variation in the fallout level since fallout depostion is strongly influenced by quantity of rainfall. Alexander and his co-workers have found a clear correlation between sr?° deposition and mean rainfall levels at five sampling locations in Clallam Co.1° Measurements of terrestrial gamma levels at these and several other sites in early October 1962 are summarized in Table II. The increase of the fallout gamma dose rates with mean annual rainfall is noteworthy, and the degree of correlation seems quite as good as that for the accumulated Sr?9 soil content. But care must be exercised here in coming to appropriate conclusions, since the quantity of relatively short-lived gamma emitters present depends on recent rainfall to a much greater ex- tent than is the case with sr?99, The Forks locations are of particular interest since these measurements were made during or between periods of heavy rainfall. The spectra show a distorted K40 peak at 1.46 MeV, which is clearly the result of a considerable Lal40 contribution at 1.6 MeV. This implies substantial recent fallout deposition; this fact is also evidenced by the lack of agreement between the two methods of estimating fallout dose rates. As mentioned previously, recent deposition generally implies a more nearly plane source than in our model, and thus more peak counts per unit dose rate for the various fallout isotopes. Therefore, our peak method would tend to overestimate the fallout dose rates. In addition, the Lal40 contribution might also cause us to overestimate the K49 and u238 dose rates, Fortunately, the Forks locations were among the few where a significant Lal40 contribution was observed. The Olympic Peninsula area was also of interest in that the natural levels (3-5 ur/hr) were among the lowest measured by us during our various surveys. These levels were about