Historical Facts

19 Sep 1957

todaySeptember 19, 2022


Nevada is site of first-ever underground nuclear explosion
On September 19, 1957, the United States detonates a 1.7-kiloton nuclear weapon in an underground tunnel at the Nevada Test Site (NTS), a 1,375-square-mile research center located 65 miles north of Las Vegas. The test, known as Rainier, was the first fully contained underground detonation and produced no radioactive fallout. A modified W-25 warhead weighing 218 pounds and measuring 25.7 inches in diameter and 17.4 inches in length was used for the test. Rainier was part of a series of 29 nuclear weapons and nuclear weapons safety tests known as Operation Plumbbob that were conducted at the NTS between May 28, 1957, and October 7, 1957.

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18 Sep 1987

Hundreds are accidentally poisoned in Brazil On September 18, 1987, cesium-137 is removed from an abandoned cancer-therapy machine in Brazil. Hundreds of people were eventually poisoned by radiation from the substance, highlighting the danger that even relatively small amounts of radiation can pose.

todaySeptember 18, 2022