The primary reason I bought Physics and Nuclear Arms Today (Readings from Physics Today) is for one particular article: The nuclear arsenals of the US and USSR, by Barbara Levi, originally published in March 1983.
As mentioned elsewhere in this series of posts, a table in the article has been updated to reflect weapon inventory in 1990.
The article describes developments in 1983.
Previous post described the probability that various weapons would destroy a target hardened to the level of a Minuteman silo.
Article introduced to me a concept of equivalent megatons (EMT). When comparing effects of nuclear weapons at different yields the kiloton rating cannot be used. The relative destructive power varies based on the yield on megaton raised to the 2/3 power. The formula is: EMP = mt^(2/3) .
In the US, we have about 40% of our EMT on bombers, with another 40% of EMT on ICBM’s, with the remainder on submarines. Because of the smaller yield, about half of the count of weapons is on subs.
In the Soviet Union, about 80% of the EMT is in the ICBM force with about 15% on submarines and a mere 5% on bombers.
Article says that in 1983 about 50% of the US SSBNs ( nuclear missile armed subs, or boomers) were on patrol at a time while only about 15% of the Soviet boomers were at sea at any one moment.