Frequent Questions

What are the critical changes between the 1992 and 2017 version of the PAG Manual?

Since 1992, the PAGs have been updated three times; the following major changes have been made and are incorporated in the 2017 PAGs:

  • Clarifying planning considerations related to the lower FDA Potassium Iodide (KI) guidance
  • Deleting the thyroid-based evacuation threshold
  • Providing additional language on using the Federal Radiological Monitoring and Assessment Center (FRMAC) derived value tables
  • Adding information from the appendices of the 1992 PAG Manual on how the PAG levels were set
  • Providing explanation about the removal of the Relocation PAG of 5rem over 50 years to avoid confusion with long-term cleanup goals
  • Applying the PAG Manual to incidents other than just nuclear power plant accidents
  • Referring users to current food guidance from the Food and Drug Administration (FDA)
  • Providing basic planning guidance on reentry, cleanup and waste disposal
  • Incorporating late phase (cleanup) guidance from the Department of Homeland Security’s Radiological Dispersal Device/Improvised Nuclear Device Planning Guidance
  • Adding a two-tiered drinking water guidance addressing both people at the most sensitive life stages and also the general population


For more information about the PAG Manual, visit the PAGs page on

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