6 7a ola =o a a 554 ITe 87 uy ay jo gage ue trom I,» Oo ma o gar 134 qzZ “awd nu ” *€ re fee gee rene tae see ax ase | UNCLASSIFIED UNCLASSIFIED that during the I-through-|l-minute period is employed to obtain the atom ratio of RaC to RaB (a) that during the l-through-11-minute period is employed to obtain the atom ratio of RaC w RaB (p) counts to be expected from any given radon concentration in the air. Extensive examples of atmospheric measurements are given which suggest that under most conditions in the free atmosphere radon is essentially at secular equilibrium with its daughter products. Other collections made following addition of radon to a restricted volume show the expected increase tn p with time, which confirms the basic validity of the procedure. counts to be expected from any given radon concentration in the air, Extensive examples of atmospheric measurements are given which suggest that under most condi- in the air sampled, the apparent age (7) of the conglomerate of radon and its daughters, and thetotal in the air sampled, the apparent age (7) of the conglomerate of radon and its daughters, and the totul tions in the free atmosphere radon is essentially at secular equilibrium with its daughter products. Other collections made following addition of radon to a restricted volume show the expected increase in @ with time, which confirms the busic validity of the procedure. UNCLASSIFIED UNCLASSIFIED UNCLASSIFIED UNCLASSIFIED that during the 1-through-1!-minute period is employed to obtain the atom ratio of RaC to RaB (p} in the air sampled, the apparent age (7) of the conglomerate of radon and its daughters, and the total counts to be expected from any given radon concertration in the air. Extensive examples of atmospheric measurements are given which suggest that under most conditions in the tree atmosphere radon is essentially at secular equilibrium with its daughter products. Other collections made following addition of radon to a restricted volume show the expected increase in p with time, which confirms the basic validity of the procedure. that during the I-through-!1-minute period is employed to obtain the atomratio of RaC to RaB (p) UNCLASSIFIED in the air sampled, the apparent age (7) of the conglomerate of radon and us daughters, and the total counts to be expected from any given radon concentration in the air. Extensive examples of atmospheric measurements are given which suggest thal under most conditions in the free atmosphere radon is essentially at secular equilibrium with its daughter produ: ts. Other collections made following addition of radon to a restricted volume show the expected increase in g with time, which confirms the basic validity of the procedure. UNCLASSIFIED