ia i stations having only gummed film sampling by the use of a regional Pot/Gummed Film factor, As an example, the following table was developed from the north- ern hemisphere stations where pot data were collected, Average Pot/Gummed Film Ratios for the Northern Hemisphere Month Jan, Feb, Mar, 1997 1938 1.4 1.6 1.3 1.2 Apr, May June 21 1.8 Li 1.4 9 1.0 1.6 1.0 July 1939 2.4 2.0 2.8 # 2.1 1,6 2.5 1.1 1.2 2.6 Oct. Nov. Dec, i) 7 1.3 1.1 2.3 2.0 2.0 2.9 1.5 2.1 2.4 3.5 Mean Ratio 1.0 1.8 2.3 Aug. 7 Sept. 2.1 1.9 These average ratio factors can still yield only an approximation and probably hold only for the northern hemisphere, There is some justification for applying the same factors to the infinity gamma dose data as well. Most of the errors can be divided into two classes, poor collection of fission products and those involved in the model computation. Poor collection would affect the Sr 9 and y dose values equally, 90 The computation model is equivalent except for the factors of % Sr’~, and of y disintegretions per 6B dpm. . . . The first is approximately ¢@ r 1.2 punction, mt0.73 for the first . +1.2 thereyear and T while the second is approximately T after. Thus, the average Pot/Film ratio may be a reasonable correction factor. There has been no attempt in this report to depict the geographical distribution of sr”, The data do not warrant this, as soil and pot analyses are more reliable for this purpose, -31- E ez +