| 400 MILES | 42 R/HR |
| 500 MILES | 12 R/HR |
In the case of the ground attack on missile silos, the following conditions are estimated:
| DOWNWIND DISTANCE FROM GROUND ZERO | DOSE RATE IN ROENTGENS/HOUR |
|---|---|
| 50 MILES | 1400 R/HR |
| 100 MILES | 320 R/HR |
| 200 MILES | 75 R/HR |
| 300 MILES | 30 R/HR |
| 400 MILES | 8 R/HR |
| 500 MILES | 1.2 R/HR |
Dosage rates for the end of the first week are estimated to have been as follows:
| 50 MILES | 2200 R/HR |
| 100 MILES | 270 R/HR |
| 200 MILES | 68 R/HR |
| 300 MILES | 16 R/HR |
| 400 MILES | 3.2 R/HR |
| 500 MILES | .8 R/HR |
These are averaged estimates only, which have been scaled according to previously known fallout characteristics and limited current data. Complete analysis will not be available for some time, although local government and military authorities have been advised about fallout hazards and subsequent medical/health consequences.
A brief summary of fallout conditions and patterns is presented in the following target-by-target descriptions:
1. NEW YORK CITY—LONG ISLAND AREA
NATURE OF TARGET: Urban center.
TYPE/YIELD OF SOVIET WEAPON: Missile-delivered thermonuclear warhead in 9–10-megaton (MT) range.
NUMBER OF WARHEADS DELIVERED: Three land targets, with some evidence of several other weapons that detonated at sea.
BURST TYPE: Airburst and groundburst.
SPECIAL FEATURES: High concentration of fission elements suggests “dirty weapon” type designed to increase fallout intensity of groundburst.
FALLOUT PATTERN: There was a frontal system active in the New York City area on this date, developing winds from a WNW direction at 10–12 knots. As a consequence, little upwind fallout occurred in upper New York— Connecticut area; most downwind fallout was seaward, with considerable centralized fallout in Staten Island, Brooklyn, Queens, and western Long Island areas.
2. WASHINGTON, D.C. AREA
NATURE OF TARGET: Urban area.
TYPE/YIELD OF SOVIET WEAPON: Missile-delivered thermonuclear warhead in 9–10 MT range.
NUMBER OF WARHEADS DELIVERED: Six warheads with possible unknown number of other nondetonating weapons.
BURST TYPE: Airburst and groundburst.
SPECIAL FEATURES: Same as 1 above.
FALLOUT PATTERN: Prevailing winds created a fallout pattern that was generally easterly with some deflection SSE. Because of Washington’s unique location, most fallout was into Maryland, and secondarily into Delaware and western New Jersey.
3. SAN ANTONIO, TEXAS AREA
NATURE OF TARGET: Urban area.
TYPE/YIELD OF SOVIET WEAPON: Missile-delivered thermonuclear warhead in 9–10 MT range.
