THE ROMEO SHOT IS DETONATED AT BIKINI ATOLL, MH

Today, The Grandma has been reading about the Romeo shot of Operation Castle that was detonated at Bikini Atoll on a day like today in 1954.

Castle Romeo was the code name given to one of the tests in the Operation Castle series of U.S. nuclear tests. It was the first test of the TX-17 thermonuclear weapon, the first deployed thermonuclear bomb.

It was detonated on March 26, 1954, at Bikini Atoll of the Marshall Islands, on a barge moored in the middle of the crater from the Castle Bravo test.

It was the first such barge-based test, a necessity that had come about because the powerful thermonuclear devices obliterated the small islands following detonation.

The tested design became the first air-droppable thermonuclear device, initially the emergency capability EC-17, of which only five were made. The first deployable staged radiation implosion Teller-Ulam thermonuclear weapon evolved into the Mark 17, of which 200 were made.

Both of those were huge devices, weighing 39,000 t and 42,000 t respectively. As a result, only the B-36 was capable of carrying that first generation of thermonuclear bombs.

They were also some of the largest yield devices deployed by Strategic Air Command -the EC-17 producing around 10 megatonnes (Mt), and the Mk 17 between 11 and 15 Mt. They were all out of service by August 1957.

The Runt TX-15 device was a weaponized dry fusion bomb, using lithium deuteride fuel for the fusion stage of a staged fusion bomb, unlike the cryogenic liquid deuterium of the first-generation Ivy Mike fusion device.

Similar to the Shrimp TX-21 device tested before in the Castle Bravo test, it differed from that device in using lithium deuteride derived from natural lithium, a mixture of 7.5% lithium-6 and 92.5% lithium-7 isotopes, as the source of the tritium and deuterium fusion fuels, as opposed to the relative high enrichment level of lithium, approximately 40% lithium-6, deuteride used in Bravo.

More information: Radio Chemistry

Like the Bravo test, it produced far more than its predicted yield, and for the same reason -an unexpected participation of the common lithium-7 isotope in fusion reactions. Although it had been predicted to produce a yield of 4 megatons with a range of 1.5 to 7 megatons, before the results of the Bravo test caused an upgrade in the estimates, it had originally been estimated to produce 3-5 megatons, it actually produced a yield of 11 megatons, the third-largest test ever conducted by the U.S.

Like the Ivy Mike and Castle Bravo tests, a large percentage of the yield was produced by fast fission of the natural uranium tamper; 7 megatons of the yield were from this source.

One particular image of the Castle Romeo fireball has been one of the most highly reprinted images of a nuclear explosion. It often serves as a stand-in for nuclear weapons in general for news stories, book covers, magazine articles... likely because of its threatening appearance and extreme red, orange, and yellow hues.

The fact that the explosion is of a U.S. megaton-range weapon has not prevented it from being used to represent the arsenals of other states or weapons of far lower yields in many cases, which would have a very different appearance.

The Castle Romeo photos are sometimes confused with that of Castle Bravo. The two nuclear blasts looked very similar, and they were both conducted in the same location, but much of Bravo's photographic record was destroyed because of its unexpectedly high yield.

More information: Atlas Missile Silo

 I do not believe that civilization will be wiped out
in a war fought with the atomic bomb.
Perhaps two-thirds of the people of the earth will be killed.

Albert Einstein