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At 4:15
64-54
7' - 2°,
or
0.0237 d.pasec.
At 4:55
80-65
11° - 5°*
"
0.0226 " # "
which is a value less than the original natural drift. Since no rise in drift
was noted, the tost la obviously negativo, and casts somo doubt on the distinct
increase in discharge observed when the gas was first tested shortly aftor our
return from Naugatuck. Perhans the amanation had been absorbed in the meantime
in walls of Duffel bag. This test on the activity of the expired air should be
repeated, since the emanating power of radium compounds deposited in bone depends
upon this result (see other report).
A Bit of Theory: Assume that we have a patient containing 1 microgram mesothorium,
measured as radium equivalente Furthor assume that in actual practice only one
percent of thorium continually generated actually gets into the testing chamber with
the expired air. Quostion: How fast will be the resulting drift, asswing that
a current of dried expired air is continually passing thru the ionization chamber?
Let the constant of the instrument be takon as 10 X 10-9 ourios per subedivision per
second. The amount of thoron present in chamber will be 18 of 1 x 10-6 X 1.28
X 10-2 = 1.28 x 10-10 ouries where 1 x 10-6 x 1.28 x ouries is the amount of
thoron generated per second by 1 microgrom mesothorium. If the ionization chamber
has a volume of 1000 00 it will have in it the thoron produced in 6 see and the
observed drift whould thus be that produced by 6 x 1.28 X 10-10 = 7.7 x 10 -10 curies.
Since a drift of 1 depesec. is produced by 10 x 10-9 curios, the observed drift will
be
7.7 X 10-10 = 0.077 d.p.sec.
10 x 10-9
and in the case of Mrs. Dumschoff whose expired air would be laden with 40 times
this quantity of thoron the observed discharge should be about 3.3 div. per sec.
This value appears to be high; but the experiment should be conducted several times
with Mrs. Dumschoff as subjecte Sone interesting data are in sight, which will
show that the presence of mesothorium can be more easily detected in the expired sir
of a living person than tha pres ence of Radon.
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"ocrText": "page - 3 -\nAt 4:15\n64-54\n7' - 2°,\nor\n0.0237 d.pasec.\nAt 4:55\n80-65\n11° - 5°*\n\"\n0.0226 \" # \"\nwhich is a value less than the original natural drift. Since no rise in drift\nwas noted, the tost la obviously negativo, and casts somo doubt on the distinct\nincrease in discharge observed when the gas was first tested shortly aftor our\nreturn from Naugatuck. Perhans the amanation had been absorbed in the meantime\nin walls of Duffel bag. This test on the activity of the expired air should be\nrepeated, since the emanating power of radium compounds deposited in bone depends\nupon this result (see other report).\nA Bit of Theory: Assume that we have a patient containing 1 microgram mesothorium,\nmeasured as radium equivalente Furthor assume that in actual practice only one\npercent of thorium continually generated actually gets into the testing chamber with\nthe expired air. Quostion: How fast will be the resulting drift, asswing that\na current of dried expired air is continually passing thru the ionization chamber?\nLet the constant of the instrument be takon as 10 X 10-9 ourios per subedivision per\nsecond. The amount of thoron present in chamber will be 18 of 1 x 10-6 X 1.28\nX 10-2 = 1.28 x 10-10 ouries where 1 x 10-6 x 1.28 x ouries is the amount of\nthoron generated per second by 1 microgrom mesothorium. If the ionization chamber\nhas a volume of 1000 00 it will have in it the thoron produced in 6 see and the\nobserved drift whould thus be that produced by 6 x 1.28 X 10-10 = 7.7 x 10 -10 curies.\nSince a drift of 1 depesec. is produced by 10 x 10-9 curios, the observed drift will\nbe\n7.7 X 10-10 = 0.077 d.p.sec.\n10 x 10-9\nand in the case of Mrs. Dumschoff whose expired air would be laden with 40 times\nthis quantity of thoron the observed discharge should be about 3.3 div. per sec.\nThis value appears to be high; but the experiment should be conducted several times\nwith Mrs. Dumschoff as subjecte Sone interesting data are in sight, which will\nshow that the presence of mesothorium can be more easily detected in the expired sir\nof a living person than tha pres ence of Radon."
}