qtwa ww 2°22 0 a SS ot (&S HI |S ~ ap OM? , WDC ~ ¢ Ey = |= eB S 2 a < Novenber 20, 1952 os c Dr. H. it. Parker, Manager Health instruments idivision Ge &. Hucleonics Preject P. 0. dex 100 Richland, Washington Dear Dr. Parker: CONFIAMT 2 OQ BE Ueto: ASSIFIET py autHoriry oF D | OEIOC" REVIEWED 2 NOISSININNOD | ADYANG OINOLV SN 9¢¢ SHAIHOUV HOC SN - g r we By: te Tet cds 6/3197 Hany thanie fer your prompt and faithful response to ny request for urmusgual radiation levels in the Hanford area. You may be interested te learn that the increases you observed checked to the day with expected time of arrival of material over northern United States and Canada, and that danford and 3reckhaven were the cnly staticns which recorded unusual ovents. High level material eressed the seuthern part of the country somewhat earlier but apparently none of it dropped low encuzh to ba detected. We do, of course, have cur Yeather gureau fall-out stations in contimial operation, but their date do net become available until about twe weeks after collection time-—-hence are of no use in evaluating the current situation. There is a second wave of material en route, but it has stagnated over the Pacific, and at this writing we have no reliable guess as te when cr where it may reach this continent. Should your stations note another rise, I would like to hear of it. 4ith regard to abatracts of the talks and panel discussions at the idaho Falls meeting, we are going to press, but I find that Z am still short two abstracts from you and one from Pass. incidentally, these should be unclase@ified. If yo. can devote a few minutes te these, 1 would greatly appreciate it. With best regards - BEST COPY AVAILABLE orice p |__BMBP WDG:mih | fours very truly, Walter D. Claus Chief, Sicphysics Branch Division of Jiolorzy jand Yedicine SURNAME p |____YLaasWc! i tf og wer ee — —MRUTALY RESEARCH &APPL | | Form AEC-318 U. S$. GOVERNMENT PRINTING OFFICE 16—6 2761-2