ee ae eee ee TABLE 3 EXPOSURE RATES IN AIR DUE TO *°K, 7°°u, and 797th IN THE SOIL (ur/hr) Detector Exposure Height (meters) Rate* per . 0 1 3 5 10 30 100 300 1% *°K % Decrease from 0 Rate* per Meter Value 1 ppm *7°ut 1.68 1.65 (1.71T) 1.60 1.56 1.47 1.22 0.72 0.19 *1% *°K = .0586 dis/cm*®, dis/om*®, Exposure soil density, 0 2 5 7 13 27 57 89 % Decrease from 0 Meter Value . 667 . 654 (.76T) .635 .618 . 583 »476 .274 . 068 1 ppm 7°° = .0198 dis/cm?, p = 1.6 gm/cm’*. 0 2 5 7 13 29 59 90 Exposure Rate* per 1 ppm 7°" % Decrease from 0 Meter value .314 . 307 (.36T) . 298 . 290 .274 .226 . 133 . 036 0 2 5 8 13 23 58 89 1 ppm 7°*Th = 6.57 x 104 tPreviously reported values‘??, tExposure rate due to radon daughters in the atmosphere has been neglected but should not amount to more than a few percent of the total exposure rate even close to the interface‘!**?,