of this equipment was 0.1 R/hr. Additionally, the Air Force established monitoring stations at Oahu, Guam, Luzon, Tokyo, Okinawa, Shemya, ata Anchorage where gamma intensity readings were planned at 12-hour infervals using a 2610A portable survey meter. HASL also established a worldwide network of 122 stations that gummed film to trap fallout particles for subsequent analyses. qsed TheJfU.S. Weather Bureau operated 39 of the stations in the continental Unite States and 14 at overseas locations; the Air Weather Service operatdd 23 overseas stations; the State Department operated 31; 3 were operated by the Navy and Coast Guard; and 2 were operated by the Atomic Bomb Caqualty Commission. The Canadian Meteorological Service cooperated by operdting 9 stations, and the Canadian Atomic Energy Commission operated 1 station. All stations were scheduled to make two simultaneous 24-hour gummed-ffilm collections starting at 1230 (GMT) each day. In addition, single gummed-film stands were installed on most ships of the Military Sea Transportation Service in the Pacific Ocean. (MSTS) scheduled to be on rdntes The ship collections were made daily (Refererke 27). Command Briefings The decision to detonate a particular test device was made at a of command briefings beginning at H-36 hours. was critical to the shot, no-shot decisions. Fallout exposure evalhhation The evaluations were sented by a senior representative of the Radsafe Office. The radsa briefing included: @ Forecast winds for H=-hour, hodographs, and resultant wind diagrams. For each briefing, hodographs were constructed with the latest wind information in order to show the development of the wind pattern. @ Surface radex areas, limiting bearings, radial dis- tances, hot area, cool area, and long-range fallout plot. The surface radex area was drawn using the hodograph for forecast H~hour winds. A 159 sector was added to each limiting bearing. A representative radial distance was indicated for a 6-hour fallout period. A hot and a cool area were indicated. The 118 Beries pre-