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Trinity Site, the Site of the First Atomic Bomb Blast

On July 16, 1945, the world’s first nuclear explosion, code named Trinity, occurred at a test site located 336 km south of Los Alamos on the barren plains known as the Jornada del Muerto in New Mexico. The plutonium device, called the Gadget, was hoisted atop a 100-foot tower and detonated at precisely 5:30 am releasing energy equivalent to 18.6 kilotons of TNT, instantly vaporizing the tower and fusing the desert sand into green glass. The shock wave was felt over 160 km away, and windows still rattled 320 km away. The success of the Trinity test meant that an atomic bomb could be readied for use by the U.S. military. The first deployment occurred on August 6, 1945, when the Uranium-235 device was dropped on Hiroshima, Japan, and the rest is history.

Today, the Trinity Site is open to public only twice a year, on the first Saturday of April and October. Each time thousands of people make a pilgrimage to check out the partially filled crater left by history’s first atom bomb test – a slight depression measuring 340 feet across. At the center, a stone obelisk made of black lava rock marks ground zero, where the bomb was detonated.


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The landmark includes the remnants of the base camp where some 250 scientists, soldiers, and technicians holed up to watch the detonation about 9 km away ground zero. Remnants of the observation points 10,000 yards out are also still visible. Only a few pieces of the green glass, which was named trinitite and still highly radioactive, remain in a protected enclosure. Outside the fenced-in ground zero area lies Jumbo, the 214-ton steel container built to contain the plutonium if the 5,300 pounds of high explosives in the bomb detonated but no nuclear explosion resulted. Jumbo was not used. There is also a restored McDonald ranch house, where the device's plutonium core was assembled.

More than sixty years after the test, residual radiation at the site is about ten times higher than earth’s background radiation and is generally harmless. Staying there for one hour exposes you to radiation that is less than the radiation received on an average day from natural and medical sources.

After being closed to the public for many years, the Trinity site was declared a National Historic Landmark district in 1965. The Trinity site is currently opened to the public by the National Park Service twice a year.


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The 12-foot tall obelisk marks ground zero. Photo credit


The remnants of Jumbo, a large 214 tons steel container whose remnants lie in Trinity Site's parking lot. Photo credit


The heat of the explosion fused sand into green colored glass beads which were named trinitite. Photo credit


The famous color photograph of the "Trinity" shot, the first nuclear test explosion. Photo credit


The Trinity Site explosion, 0.016 second after explosion. Photo credit


The tower with "the gadget" used in the Trinity test, 1945. Photo credit

Sources: Wikipedia /

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