0. ICRP: International Commission on Radiological Protection
   1. Real-time radiation exposure is computed as an effective dose rate, which is a body-average over the radiative-sensitive organs and tissues, in units of microsievert per hour (uSv/hr). Annual or flight accumulated effective dose is reported in units of millisievert (mSv; Note: 1 mSv = 1000 uSv).
   2. ICRP recommended annual limit for occupationally exposed radiation workers (including aircrew) is less than 20 mSv. If the predicted exposure is less than 1/3 of this limit, the safety signal color will be green - indicating minimal radiation exposure. If the predicted exposure is between 1/3-2/3 of the ICRP recommended limit, the safety signal color will be yellow - indicating that close tracking of individual radiation exposure is advised. If the predicted exposure is greater than 2/3 the recommended limit, the safety signal color will be red - indicating exposure to maximum recommended limit is possible.
   3. ICRP recommended annual limit for public sector radiation exposure is less than 1 mSv. If the predicted exposure is less than 1/3 of this limit, the safety signal color will be green - indicating minimal radiation exposure. If the predicted exposure is between 1/3-2/3 of the ICRP recommended limit, the safety signal color will be yellow - indicating that close tracking of individual radiation exposure is advised. If the predicted exposure is greater than 2/3 the recommended limit, the safety signal color will be red - indicating exposure to maximum recommended limit is possible.
   4. ICRP recommended limit for prenatal radiation exposure is less than 1 mSv annually and less than 0.5 mSv in any one month during pregnancy. The signal indicator color is based on the 0.5 mSv limit. If the predicted exposure is less than 1/3 of this limit, the safety signal color will be green - indicating minimal radiation exposure. If the predicted exposure is between 1/3-2/3 of the ICRP recommended limit, the safety signal color will be yellow indicating that close tracking of individual radiation exposure is advised. If the predicted exposure is greater than 2/3 the recommended limit, the safety signal color will be red - indicating exposure to maximum recommended limit is possible.
   5. The predicted aircrew exposure is based on the current NAIRAS modeled exposure rate multiplied by the maximum annual flight hours for pilots, which is 800 hrs. If an aircrew member, for example, expects to fly only 500 hrs per year, then multiply the NAIRAS predicted radiation exposure by 5/8. If an aircrew member expects to fly 700 hrs per year, then multiply the predicted radiation exposure by 7/8, and so on.
   6. The predicted public and prenatal exposure for the representative high-latitude flights is based on the current NAIRAS modeled exposure rate multiplied by the average flight time.