Castle Union

Castle Union
Castle Union
	The Castle Union test of the Mark 14 design.
Information
Country	United States
Test series	Operation Castle
Test site	Bikini Atoll
Date	April 26, 1954
Test type	Atmospheric
Yield	6.9 megatons of TNT
Test chronology
	← Castle Koon Castle Yankee →

Castle Union was the code name given to one of the tests in the

nuclear tests. It was the first test of the TX-14 thermonuclear weapon

(initially the "emergency capability" EC-14), one of the first deployed U.S. thermonuclear bombs.

An "Alarm Clock" device is a "dry"

cryogenic liquid deuterium of the first-generation Ivy Mike

fusion device.

It differed from the Castle Romeo "Runt" device, tested shortly before, in using highly enriched lithium (approximately 95% lithium-6; natural lithium is a mixture of lithium-6 and lithium-7 isotopes). The "Runt" device had 7.5% lithium-6 in the fusion fuel.

The test took place on April 26, 1954 at

Bikini atoll of the Marshall Islands, on a barge moored in the lagoon, off Yurochi island. The yield of 6.9 megatons of TNT

was roughly double the predicted 3-4 megatons. Although the barge had been moored in over 160 feet (49 m) of water, the test left a crater 3,000 feet (910 m) in diameter and 90 feet (27 m) deep in the bottom of the lagoon.

Like the Ivy Mike, Castle Bravo, and Castle Romeo tests, a large percentage of the yield was produced by fast fission of the natural uranium tamper, which contributed to the extensive fallout caused by these tests.

As the highly enriched lithium was both expensive and scarce at the time, it limited the number of these weapons that could be produced. The "Runt" design tested in Castle Romeo and Castle Yankee was preferred for deployment.

External links

Wikimapia
The short film Operation Castle Commanders Report (1954) is available for free viewing and download at the Internet Archive.
The short film Military Effects Studies Operation Castle (1954) is available for free viewing and download at the Internet Archive.
The short film Nuclear Test Film - Operation Castle (1954) is available for free viewing and download at the Internet Archive.
Operation Castle

References

Chuck Hansen, U. S. Nuclear Weapons: The Secret History (Arlington: AeroFax, 1988)

11°41′02″N 165°24′36″E / 11.68389°N 165.41000°E / 11.68389; 165.41000