Dr. Phillips reports on E-RAD, a new model of aviation radiation monitoring from Spaceweather.com and the Earth to Sky Calculus group. It can predict how much cosmic radiation a passenger will absorb flying on any commercial jet across the USA. Researchers have long known that cosmic rays penetrate the hulls of commercial aircraft. At typical cruising altitudes, pilots, flight attendants and passengers typically receive a dose rate 40 to 70 times higher than natural radiation on the ground below. The higher a plane flies, the more radiation it receives. This has prompted the International Commission on Radiological Protection (ICRP) to classify pilots as occupational radiation workers–just like nuclear power plant engineers.
Most people stepping onboard an airplane have no idea they are about to encounter cosmic rays–much less do they know what the dose rate might be. And that is where E-RAD comes in. If want to find out about your exposure, enter a flight number and E-RAD predicts your exposure to cosmic rays. This new model has been years in the making. Since Jan. 2015, Spaceweather.com and the students of Earth to Sky Calculus have been monitoring cosmic rays in airplanes. The method is simple: Staff board planes carrying the same cosmic ray payload routinely flown to the stratosphere on their space weather balloons. Inside the airplane they measure X-rays, gamma-rays and neutron dose rates, along with GPS altitude, latitude and longitude.
Their data set is impressive. So far they have gathered 18,518 GPS-tagged radiation measurements during 72 flights over 2 oceans and 5 continents.The group has spent 276.6 hours onboard planes taking data. These numbers are increasing rapidly with new flights every month.
The E in E-RAD stand for “Empirical.” In other words, the model is based on real-life measurements, not theoretical calculations that might be wrong. Moreover, the data-set is new. Because it is constantly being updated, E-RAD naturally keeps up with variables that affect cosmic rays–for instance, the waxing and waning of the solar cycle and changes in Earth’s magnetic field. At the moment, the bulk of their data (70%) is concentrated over the continental USA, and that is where their predictions apply. The blue curve (in the article) traces radiation dose rates actually observed inside the airplane, while the red curve is E-RAD’s prediction. The two agree within 10% for most of the flight. These errors are constantly shrinking as they add new readings to their database.
They are also improving their model outside the continental USA. Recent trips to Nepal, Hong Kong, Australia and New Zealand, have added hundreds of hours of new data to the foundation of E-RAD. Soon, we will be able to issue predictions for those areas as well. Stay tuned for updates from 35,000 feet.
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