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the expired air method. I have this morning made my own calculations, based
on Dr. Flinn's data, and while my figures virtually check yours on the gamma
ray method, I am unable to check them with regard to the expired air.
The net discharge for the expired air, I find to be approximate-
ly 0,0057 div/sec, which multiplied by the constant of the instrument, 7 x 10-9,
gives 40 K 10-12
. Assuming that the amount of air contained in the chamber
would be expired in 18 sec. the amount per sec. would be 2.2 x 10-12 curies.
The amount of radium required to liberate the radon equivalent to this value
would be approximately 1 x 10-6 curies or one microgram.
Will you kindly check this data over, and see wherein our
difference lies?
Sincerely yours,
Vice President.
HHBarkor: RII
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"ocrText": "-2-\nthe expired air method. I have this morning made my own calculations, based\non Dr. Flinn's data, and while my figures virtually check yours on the gamma\nray method, I am unable to check them with regard to the expired air.\nThe net discharge for the expired air, I find to be approximate-\nly 0,0057 div/sec, which multiplied by the constant of the instrument, 7 x 10-9,\ngives 40 K 10-12\n. Assuming that the amount of air contained in the chamber\nwould be expired in 18 sec. the amount per sec. would be 2.2 x 10-12 curies.\nThe amount of radium required to liberate the radon equivalent to this value\nwould be approximately 1 x 10-6 curies or one microgram.\nWill you kindly check this data over, and see wherein our\ndifference lies?\nSincerely yours,\nVice President.\nHHBarkor: RII"
}