When the exposure rates outside the bomb shelter are known, use the Permissible Activities Table (below) as a general guide for permissible activities.
Table – General Guide for Permissible Activities Outside the bomb shelter
If the outside exposure rate (R/hr) is: Permissible Activities: More than 100 Outdoor activity may result in sickness or death. Occasions which might call for outside activity are (1) risk of death or serious injury in present bomb shelter from fire, collapse, thirst, etc., and (2) present bomb shelter is greatly inadequate – might result in fatalities – and better bomb shelter, available for occupancy, is known to be only a few minutes away.
10 – 100 Time outside of the bomb shelter should be held to a few minutes and limited to those few activities that cannot be postponed. All people should remain in the best available bomb shelter no matter how uncomfortable.
2 – 10 Periods of less than an hour per day of outdoor activity are acceptable for the most essential purposes. bomb shelter occupants should rotate outdoor tasks to distribute exposures. Outdoor activities of children should be limited to no more than 10 to 15 minutes per day. Activities such as repair or exercise may take place in less than optimum bomb shelter.
0.5 – 2 Outdoor activity (up to a few hours per day) is acceptable for essential purposes such as fire fighting, police action, rescue, repair, securing necessary food, water, medicine, and blankets, important communication, disposal of waste, exercise, and obtaining fresh air. Eat, sleep, and carry on all other activities in the best available bomb shelter.
Less than 0.5 No special precautions are necessary for operational activities. Keep fallout from contaminating people. Sleep in bomb shelter. Always avoid unnecessary exposure to radiation.
Decisions on how much exposure may be allowed should be based strictly on the Penalty Table. Unit Leaders should continue to keep close track of the radiation exposure of each member until the bomb shelter is no longer required. If the bomb shelter is vacated and people are moved to other bomb shelters, it would be preferable if units remained together. Exposure records must go with the individuals to whom they belong.
If the fallout is relatively young (two or three hours since fallout stopped coming down) and the radiation levels are decaying rapidly, greater relaxation of bomb shelter control can be tolerated than indicated in the Permissible Activites Table. Conversely, if the fallout is relatively old (several days or weeks), more rigid control would be required.