Chapter 11 — WATCH ROUTINES (CONTINUED) 



Table 11-3. — Navy radioactive fallout code and description — Continued 



CODE GROUP 



DESCRIPTION 



T, T L , T H 



Designation of applicable template for actual burst 

 (T), Low Yield (T,), or High Yield (T H ). 

 Code Template 



1 ALPHA 



2 BRAVO 



3 CHARLIE 



4 DELTA 



5 ECHO 



6 FOXTROT 



dd 



Direction of effective fallout wind measured in tens of 

 degrees clockwise from true north. 



ss 



Fallout wind speed in knots. 



YYYYY 



Yield of weapon in kilotons (KT). This will always be 

 coded as a five-figure group, (i.e., 00001 - 1KT, 

 10000 = 10,000 KT = 10 Megaton (MT). 



DDDDD 



The distance in nautical miles from surface zero measured 

 along the fallout axis to the 200r contour. The 200r con- 

 tour represents a total radiation dose of 200 roentgens (r) 

 to 48 hours after detonation. This can be determined from 

 figure 10-58 of this manual. 



NOTES: 1. When two or more areas are included in a fallout prediction message, the 

 heading should only be used at the beginning of the collective. The coded 

 groups may be repeated as necessary. 



2. For pre-burst prediction, low-yield will be defined as yield of a 20KT 

 weapon and high yield will be that of a 5 MT weapon. 



breakdown of the individual symbols. The 

 templates referred to in this table are depicted 

 in figures 11-25 through 11-27. 



RADIOACTIVE FALLOUT DIAGRAM 



The RADFO diagram is made available to 

 operational commands in order to provide the 

 basis for immediate decisions, with respect to 

 evasive action, evacuation, radiological coun- 

 termeasures, etc., following a nuclear explo- 

 sion, 



The information contained in the coded mes- 

 sage is translated into geographical terms by 

 moans of an overlay. 



Since the overlay will be used frequently, 

 it is suggested that it be prepared ahead of 



time for RADFO use by putting certain perma- 

 nent markings on it. For convenience, the perma- 

 nent markings are inscribed on the reverse 

 side of the overlay and covered with Scotch 

 tape, so that temporary marks can be wiped 

 off without, disturbing the permanent ones. Use 

 a sheet of transparent plastic large enough to 

 cover approximately 500 miles by 300 miles 

 on the base map to be used. In one corner print 

 the following legend, using MIRROR script. 



RADFO Overlay 



Valid time. 



Location. 



Map scale. 



225 



