plik


’ž84. We note that 3.82 days is 330048 s, and that a becquerel is a disintegration per second (see §43-3). From Eq. 34-19, we have T1/2 N R Bq 330048 s atoms = = 1.55 × 105 =7.4 × 1010 V V ln 2 m3 ln 2 m3 where we have divided by volume V. We estimate V (the volume breathed in 48 h = 2880 min) as follows: Liters 1m3 breaths 2 40 (2880 min) breath 1000 L min which yields V H"200 m3. Thus, the order of magnitude of N is N atoms (V) H" 7 × 1010 200 m3 H" 1013 atoms . V m3

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