Source: Chron.com | John D. Hardin, Houston Chronicle | January 31, 2017
The U.S. National Nuclear Security Administration, or NNSA, will test for naturally occurring radiation around the city on Tuesday using a low-flying helicopter.
The test is designed to establish a baseline for officials of Houston’s radiation levels in support of Super Bowl LI. The NNSA is a U.S. Department of Energy agency responsible for assisting national security, working to reduce the threat of weapons of mass destruction.
According to a NNSA press release, the helicopter will fly in a grid pattern over the areas at 150 feet or higher above ground surface, at a speed of approximately 80 miles per hour. Officials from NNSA said the radiation assessment will cover approximately 7.5 square miles.
Flyovers will occur only during daylight hours, and it is estimated to take about three hours to complete per area.