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Portal:Nuclear technology

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On 21 January 1968, an aircraft accident, sometimes known as the Thule affair or Thule accident (/ˈtli/; Danish: Thuleulykken), involving a United States Air Force (USAF) B-52 bomber occurred near Thule Air Base in the Danish territory of Greenland. The aircraft was carrying four B28FI thermonuclear bombs on a Cold War "Chrome Dome" alert mission over Baffin Bay when a cabin fire forced the crew to abandon the aircraft before they could carry out an emergency landing at Thule Air Base. Six crew members ejected safely, but one who did not have an ejection seat was killed while trying to bail out. The bomber crashed onto sea ice in North Star Bay, Greenland, causing the conventional explosives aboard to detonate and the nuclear payload to rupture and disperse, resulting in radioactive contamination of the area.

The United States and Denmark launched an intensive clean-up and recovery operation, but the secondary stage of one of the nuclear weapons could not be accounted for after the operation was completed. USAF Strategic Air Command "Chrome Dome" operations were discontinued immediately after the accident, which highlighted the safety and political risks of the missions. Safety procedures were reviewed, and more stable explosives were developed for use in nuclear weapons.

In 1995, a political scandal arose in Denmark after a report revealed the government had given tacit permission for nuclear weapons to be located in Greenland, in contravention of Denmark's 1957 nuclear-free zone policy. Workers involved in the clean-up program campaigned for compensation for radiation-related illnesses they experienced in the years after the accident.
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Credit: Samat Jain
Trinity Site obelisk.

The black plaque on top reads:

Trinity Site
Where The World's First Nuclear Device Was Exploded On July 16, 1945
Erected 1965 White Sands Missile Range J. Frederick Thorlin Major General U.S. Army Commanding

The gold plaque below it declares the site a National Historic Landmark, and reads:

Trinity Site has been designated a National Historical Landmark
This Site Possesses National Significance In Commemorating The History of the United States of America
1975 National Park Service United States Department of the Interior

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Priscilla Duffield (April 8, 1918 – July 21, 2009, née Greene) worked on the Manhattan Project during World War II. She was secretary to Ernest O. Lawrence at the Radiation Laboratory, and to J. Robert Oppenheimer at the Los Alamos Laboratory. After the war she was executive assistant to directors of the Scripps Institute of Oceanography and the National Accelerator Laboratory.

A graduate of the University of California, from which she obtained a degree in political science, Priscilla Greene started working for Lawrence in February 1942, and then for Oppenheimer later that year. She arrived in Santa Fe, New Mexico, in March 1943, and established the Los Alamos Laboratory's office. She became the office manager at Los Alamos, greeting visitors, answering the telephone, making travel arrangements, arranging security passes and accommodation, and taking notes of telephone calls. In September 1943, she married Robert B. Duffield, a chemist working at the Los Alamos laboratory, and changed her surname from Greene to Duffield.

In the post-war years, Duffield was secretary and executive assistant to Roger Revelle, the director of the Scripps Institution of Oceanography. In November 1967, she became secretary and executive assistant to Robert R. Wilson, the founding director of the National Accelerator Laboratory, and once again she helped establish a new scientific laboratory on a new site. In later life she moved to Colorado, where she served on the board of the Uncompahgre Medical Clinic. (Full article...)

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