ne UNCLAS IFIED chamber in detecting « sealed gazma-ray sour a sealed ionization because of the better si we found the ion chamber superior Here e alphas to background ratio. However, for ionization produced by feasib! betas, ® the air conductivity air survey method is the only measur It is planned to further test these two methods for one. cammn ani bets emikters a dispersed and open source (fall-out) of both at Operation Ranger. g. At our invitetion, Dr. Failla of Columbia University a team here to evaluate a simple approximately tisrue-equivalent chamber against © much more coaplicated exactly tissue-equivslen in fluxes of neutrons of different energies. The results showed the simple chamber is quite adequate for neutron dosimetry irres of energy from thermals to 14 MEV and can be easily designed to this well below tolerance levels. h, An evaluation of the total time that a pilot might blind to important aircraft instruments after seeing the fire ball of an atomic bomb has been made, The sun was used as @ source. 4. Meteorology a. General Changes and Improvements: 1) Personnel and Administration: The present personnel] quote and administrative pzoce- dures for the Meteorology Section were established jointly by al Health Division Leader and the Chief, Air Weather Service, earlyjin 1950. The authorised strength of the Section is four persons, all of "2 UNCLASSIFIED 00130915 022 LOuRNS