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Extracted text
OCR Page 1 of 2A notation, NOV 22, 1928
Let us consider a subject whose expired air conta ins 1 X
10-10
curies
of
radon per liter. This volume of expired air is exhaled, let us say, in
10 seconds. At this rate of transpiration what amount of radon will be ex-
pired per day? Evidently the quantity of radon expired per second will be
one-tenth of 1 X 10-10 curies, or 1 X 10-11, and it follows further that
-11
the quantity of radon expired per minute will be 60 x 1 X 10
=
6 x 10-10 curies and per hour the value will be 60 X 6 X 1010 or 3.6 x 10-8
curies, and per day, the quantity is 24 x 3.6 x 10-8 = 8.6 x 10-7 = 0.86 micro-
grams.
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