NRL REPORT 6374
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TOTAL B COUNTS DURING INITIAL DECAY PERIOD (ty-;))
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COUNTING RATE PATIO ter-7I74, i"
03
1.0
Fig. 7 — Effect of absorber thickness on the relationship between the total counts during theinitial period (¢1-11)
and the ratio of the counting rates at tg-71 and ¢;.,, and for a radon concentration of 100 pCi/m? and a filtration
rate of 1 m/min for 20 min.