The U.S. Air Force will soon deploy a WC-135 Constant Phoenix aircraft to test for radiation near North Korea, part of the U.S. military’s ongoing effort to determine what the country’s provocative nuclear bomb test entailed.

The use of the so-called nuclear “sniffer plane” was confirmed on Tuesday by an official at the Pentagon, speaking on condition of anonymity due to the sensitivity of the operation. The aircraft collects air samples and debris, and is a modified version of a C-135B or EC-135C Boeing airplane. It will determine whether the explosion was actually a hydrogen blast, as North Korea has claimed. That assertion has been viewed with widespread skepticism by nuclear weapons experts.

“We’ll know for sure once the WC-135 gets air samples,” the defense official said.

Air Force

The Constant Phoenix was commissioned by Army Gen. Dwight D. Eisenhower in September 1947, as he gave the Army Air Forces — a precursor of the Air Force — responsibility for detecting atomic explosions worldwide, Air Force officials said. The mission was initially assigned to the WB-29 aircraft, but was swapped over to WB-50 and eventually the WC-135 by 1965.

Air sample missions have been carried out routinely since, with the WC-135 playing a key role in tracking radioactive debris after the disaster at the Chernobyl nuclear plant in the Soviet Union in 1986, according to an Air Force fact sheet. The WC-135 is currently the only aircraft in the service carrying out air-sampling missions, with crews from the 45th Reconnaissance Squadron at Offutt Air Force Base in Nebraska typically manning them. Equipment on board is operated by members of the Air Force Technical Applications Center.

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