ee ee ee som TABLE 5 Experimental Evaluation of 0.20 wCi Radon Released into a Chamber (Room) of 35 m? Volume and Sampled at the Rate of 0.212 m*/min* Count t1.14 Sample| Elapsed Pee’ Time . (min) Counter Unit Gross ; Background Count fern ThB+C; os Fission Products Net Gross ; Background ThB+C: ae Fission Products Count Net) Ratic : Correction Factors |éeeaféin Corrected Count Flowt Filter . Efficiency fiat Expected Count , tia From 100 pCi/m? Calculated Radon Conc. (pCisms) Pam" Radon Corr. for p p§ Equilibrium 4 Assumedt z ] 0-20 D 8840 ~313 —122 8405 4740 —313 —114 4313 0.513 4.72 1.00 39670 1395 2844 961 0.29 2 30-50 D 16900 —313 —122 16465 7700 —313 —1l4 7273 0.442 4.72 1.00 77745 2370 3279 1882 0.45 x a 3 60-80 M 18500 —270 —122 18108 7800 —270 -114 7416 0.410 4.72 1.00 85470 2895 2952 2183 0.56 4 4 90-110 M 17700 —270 —122 17308 7390 —270 —i14 7006 0.405 4.72 1.00 81694 2950 2769 2086 0.58 oa 5 120-140 D 17400 —313 ~- 122 16965 7205 —313 —114 |6778 0.400 4.72 1.06 80075 3270 2449 1939 0.60 6 150-170 D 15400 —313 —122 14965 6310 —313 —114 5883 0.393 4.72 1.00 70635 3455 2044 17i1 0.63 7 285-305 M 16500 —270 —122 16108 6600 — 270 —114 6216 0.386 4.72 1.00 76030 3460 2197 1942 0.66 8 310-330 D 16000 —313 —122 15565 6700 —313 —114 6273 0.403 4.72 1.00 73467 3205 2292 1779 0.59 «J - *Radon was added during the first 3 min (approx.) of the experiment, cigarene smoke was added 10 min before and 170 min und 305 min after the start of the run. The background of old radon in the room was approximately 500 pCi/mi. Tl tReciprocal of 0.212 m/min. $The expected counts from 100 pCi/m® of radon in equibrium wath is daughters are £130 for counter uni D and 3915 for counter unt M. §Determined from te-ri/éi i using the 10-mil-absorber curve shown in Fig. 6.