TN 70 / TN 71

Missile warheadFranceThermonuclear (staged)

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Yield · TNT equivalent150 kt

Key specs

Country: France
Design: Thermonuclear (staged)
Type: Missile warhead
In service: 1985

Overview

The 150 kt thermonuclear warheads of the M4 submarine-launched missile, France’s first with multiple warheads (six per missile). The TN 70 entered service in 1985 and was replaced from 1987 by the lighter TN 71.

Effect radii: estimates

Calculated for 150 kt

Fireball, maximum radius: ≈ 450 m
Initial radiation, 500 rem (5 Sv): ≈ 2.2 km
Blast 5 psi: most buildings collapse: ≈ 3.8 km
Thermal: third-degree burns: ≈ 5.2 km
Blast 1 psi: windows shatter: ≈ 12 km

Estimated ground ranges for an air burst at the optimum height over flat, open ground, computed from the yield with standard scaling laws. These are not measurements: real effects depend on the height of burst, terrain, buildings and weather.

Formulas from: Glasstone & Dolan, The Effects of Nuclear Weapons (1977), chapter II; Carey Sublette, Nuclear Weapons FAQ, section 5

Sources

TN 70, Wikipedia