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Trinity (nuclear test)

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Trinity (nuclear test)

Trinity was the first detonation of a nuclear weapon, conducted by the United States Army at 5:29 a.m. Mountain War Time (11:29:21 GMT) on July 16, 1945, as part of the Manhattan Project. The test was of an implosion-design plutonium bomb, or "gadget" – the same design as the Fat Man bomb later detonated over Nagasaki, Japan, on August 9, 1945. Concerns about whether the complex Fat Man design would work led to a decision to conduct the first nuclear test. The code name "Trinity" was assigned by J. Robert Oppenheimer, the director of the Los Alamos Laboratory. The name was possibly inspired by the poetry of John Donne. Planned and directed by Kenneth Bainbridge, the test was conducted in the Jornada del Muerto desert about 35 miles (56 km) southeast of Socorro, New Mexico, on what was the Alamogordo Bombing and Gunnery Range, but was renamed the White Sands Proving Ground just before the test. The only structures originally in the immediate vicinity were the McDonald Ranch House and its ancillary buildings, which scientists used as a laboratory for testing bomb components. Fears of a fizzle prompted construction of "Jumbo", a steel containment vessel that could contain the plutonium, allowing it to be recovered, but Jumbo was not used in the test. On May 7, 1945, a rehearsal was conducted, during which 108 short tons (98 t) of high explosive spiked with radioactive isotopes was detonated. 425 people were present on the weekend of the Trinity test. In addition to Bainbridge and Oppenheimer, observers included Vannevar Bush, James Chadwick, James B. Conant, Thomas Farrell, Enrico Fermi, Hans Bethe, Richard Feynman, Isidor Isaac Rabi, Leslie Groves, Frank Oppenheimer, Geoffrey Taylor, Richard Tolman, Edward Teller, and John von Neumann. The Trinity bomb released the explosive energy of 25 kilotons of TNT (100 TJ) ± 2 kilotons of TNT (8.4 TJ), and a large cloud of fallout. Thousands of people lived closer to the test than would have been allowed under guidelines adopted for subsequent tests, but no one living near the test was evacuated before or afterward. The test site was declared a National Historic Landmark district in 1965 and listed on the National Register of Historic Places the following year.

Infobox

Country
United States
Test site
Trinity Site, New Mexico
Date
July 16, 1945(80 years ago) (1945-07-16)
Test type
Atmospheric
Device type
Plutonium implosion fission
Yield
25 kt (100 TJ)

Tables

Fission bomb's energy distribution in the "moderate" kiloton range near sea level · Explosion › Instrumentation and measurements
Blast
Blast
Contemporary fundamental physics, data from the Trinity test, and others, resulted in the following total blast and thermal energy fractionation being observed for fission detonations near sea level
Blast
Contemporary fundamental physics, data from the Trinity test, and others, resulted in the following total blast and thermal energy fractionation being observed for fission detonations near sea level
50%
Thermal energy
Thermal energy
Contemporary fundamental physics, data from the Trinity test, and others, resulted in the following total blast and thermal energy fractionation being observed for fission detonations near sea level
Thermal energy
Contemporary fundamental physics, data from the Trinity test, and others, resulted in the following total blast and thermal energy fractionation being observed for fission detonations near sea level
35%
Initial ionizing radiation
Initial ionizing radiation
Contemporary fundamental physics, data from the Trinity test, and others, resulted in the following total blast and thermal energy fractionation being observed for fission detonations near sea level
Initial ionizing radiation
Contemporary fundamental physics, data from the Trinity test, and others, resulted in the following total blast and thermal energy fractionation being observed for fission detonations near sea level
5%
Residual fallout radiation
Residual fallout radiation
Contemporary fundamental physics, data from the Trinity test, and others, resulted in the following total blast and thermal energy fractionation being observed for fission detonations near sea level
Residual fallout radiation
Contemporary fundamental physics, data from the Trinity test, and others, resulted in the following total blast and thermal energy fractionation being observed for fission detonations near sea level
10%
Contemporary fundamental physics, data from the Trinity test, and others, resulted in the following total blast and thermal energy fractionation being observed for fission detonations near sea level
Blast
50%
Thermal energy
35%
Initial ionizing radiation
5%
Residual fallout radiation
10%

References

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