Low-Flying Helicopter Will Make Daily Flights Over King, Pierce Counties July 11-28

Rentonites are familiar with the sights and sounds of all shapes and sizes of aircraft flying in, out and over town, but over the next week there will be an additional low-flying helicopter on a mission to map 'normal' amounts of radiation over King and Pierce counties.

show the value of a project to measure background radiation levels in several parts of the state. A low-flying helicopter will gather radiological readings this summer, starting next week around Puget Sound. Information about the project is available on the agency Aerial Radiological Survey website www.doh.wa.gov/ehp/rp/rep/aerial.htm.

Radiation detection equipment mounted in a helicopter will measure "gamma emitters" like cesium and radioactive iodine — materials that would likely increase in a radiation emergency. This kind of material releases X-rays, or gamma radiation, a type that can be easily measured from the helicopter. State radiation experts expect to find natural radioactivity and material produced by licensed radioactive material users such as hospitals.

The helicopter will fly a grid pattern at an altitude of about 300 feet to collect data. Mapping the normal amounts and location of radioactive material will provide a baseline for comparison to assess contamination if there were a nuclear incident like the events in Fukushima. Sampling in that area of Japan after the nuclear reactors were damaged produced radiation readings, but there was no baseline for comparison so it was unclear how much higher the levels had grown.

The Washington State Department of Health is overseeing the project as the U.S. Department of Energy’s Remote Sensing Laboratory Aerial Measurement System conducts the flyover. The project has been in planning since 2009 and is funded by a grant from the U.S. Department of Homeland Security.

The data collected will be part of a report after quality assurance review. The report will be available to the public, though some information may be withheld for national security reasons. If levels of radioactivity are high enough to pose any health concern, the source will be investigated. Helicopter survey maps urban radiation.

The flyovers will start in Seattle and Bellevue before moving to other areas of King and Pierce Counties, including Tacoma. During the Puget Sound flyovers, the helicopter will be based at Boeing Air Field and will make daily flights between July 11 and 28.

Public questions can be sent to prepare@doh.wa.gov. The Department of Health website (www.doh.wa.gov) is your source for a healthy dose of information. Also, find us on Facebook and follow us on Twitter.