A special unit used for the application of safety measures regarding nuclear material. The quantity in effective kilograms corresponds:

  • for plutonium to its weight in kilograms,
  • for uranium with an enrichment of 1% and more to its weight in kilograms multiplied by the square of its enrichment,
  • for uranium with an enrichment below 1% and more than 0.5% to its weight in kilograms multiplied by 0.0001,
  • for depleted uranium (0.5% and below) and for thorium to its weight in kilograms multiplied by 0.00005.