August 12, 1953

August 12, 1953

The first test of a Soviet thermonuclear device takes place. The test, which became known as Joe-4 (this had been the fourth Soviet nuclear explosion whose occurrence was announced by the United States), took place at the Semipalatinsk test site and yielded roughly 400 kilotons of TNT.

Date Range: 
1953CE Aug 12th