Extension of UCRL-50936 (13 case studies) as requested by PNE, USAEC

This report contains a reassessment of the Kra Canal Project. This latest assessment differs from the original study in that: Thirty- four salvos with a total yield of about 170 MT were assumed; `Acceptable` firing days were selected from actual meteorological data when the winds at all levels up to the expected debris cloud top blew toward the west, +/- 30 degrees; and the lead in the devices was assumed to be from monazite sand. The doses are considerably less than those estimated in the earlier report. The reasons for this are: A longer trajectory to Sumatra was assumed such that the debris clouds traveled 1600 Km before crossing the west coast of Sumatra; Residents of the Nicobar Islands and Sumatra to our knowledge do not consume milk, hence the forage-cow-milk pathway is not included; The use of lead from monazite sands reduced the total dose; Some of the latest dose conversion constants used are smaller than those in the earlier report; and the effects of precipitation scavenging were based on an improved assessment