NAIRAS Model: Radiation Dose Rates (IMAGE) NASA/Goddard Space Flight Center Caption Radiation dose rates, seen in this NAIRAS model, increase with altitude and latitude and can vary from hour to hour. Rates for Nov. 14, 2012, 20:00-21:00 GMT are shown above. Warmer colors indicate higher amounts of radiation. Credit NASA/NAIRAS Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.