QE QD LIWT a ch Hd tH n io RY TyeeASa ih | We believe tnat the chemical method would give a more accurate figure for this ratio but that either method would give better accuracy than is avallable to U.S. analysts on Soviet weapons. | ] pet. racer proposal would appear bo have some practical advantages with respect to ease of handling foreign observers at the test site. In view of the urgency of getting an answer to this problem > I have taken the liberty of sending the above request to Carson Mark at Los Alamos and to Harold Brown at Livermore. I hope to see you on Tuesday the 15th to discuss the mechanics of getting the opinions of your Committee on this problem without having a full-dress meeting. Signed D. L. Northrup ~ 22 - Appendix "G" PVE AAy Taeyal |

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