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Maddinger.
2.
4.30 P.M.
Div. read
50
to
45
14' 20"
.00581 d/p/s.
4.50 P.M.
"!
45
!f
40
14'2"
00593 d/p/s.
Standard
"
50
"
44
32 °
23"
00308 d/p/s.
Because of more recent investigation I have adopted the factor
0.000150 as the net drift produced by one microgram of radium rather
than the factor 0.000085 which we took in our early work. This is the
factor used by the Public Health Service and was confirmed by Dr.
Schlundt and myself.
Using the factor .000150 a/p/s I estimate that the gamma ray test
made with Mrs Maddinger facing the table shows the presence of 10 micro-
grams of radium. If the old standard were used this would be raised to
17.8 micrograms. With Mrs Maddingers back to the instrument we estimate
the quantity of radio-active material present to be 18.6 micrograms by our
present standard or 33.8 by the old standard.
Expired Air Test.
The test on the expired air was made in Room e -420 using the ionization
chamber marked S.P. 1009.
The readings were made with the Lind Electroscope.
Natural Leake:
12.45 P.M.
Div read
89
to 83
501
58"
00196 d/p/s/.
1.45 P.M.
"
83
" 74
761
26"
00196 d/p/s/
Mrs Maddinger blew ligivoly her expired air into the ionization chamber
for four minutes, the expired air passing through three towers, one containing
CaCl, a second soda-lime and the last one cotton before entering the cham-
er itself. a minute was allowed before making readings, altho the fall
of the leaf was noted to detect the presence of any mesothorium during that
time.
3.20 P.M.
Div read
90
to
75
35°39"
00748 d/p/s.
increase in fall .00552 d/p/s.
4.23 ff
11
93
ff
77
331 50"
00874 d/p/s.
increase in fall .00688 d/p/s.
5.20 "
"
93
"
77
30' 38"
00870 d/p/s.
increas
.00684 d/p/s.
6.20
"
"
97
!!
86
19 13"
,00954 d/p/s.
increase 00758 d/p/s.
My experience does not permit me to give any estimation as to the amount
of radium this increase in leake represents. It all depends on how the
radium is deposited in the body and my experiments indicate that this va-
ries with the animal. But taking Dr. Schlundt's method for estimation we
would say that the net positive drift in this case indicated 1.50 micro-
grams of radium.
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"ocrText": "Maddinger.\n2.\n4.30 P.M.\nDiv. read\n50\nto\n45\n14' 20\"\n.00581 d/p/s.\n4.50 P.M.\n\"!\n45\n!f\n40\n14'2\"\n00593 d/p/s.\nStandard\n\"\n50\n\"\n44\n32 °\n23\"\n00308 d/p/s.\nBecause of more recent investigation I have adopted the factor\n0.000150 as the net drift produced by one microgram of radium rather\nthan the factor 0.000085 which we took in our early work. This is the\nfactor used by the Public Health Service and was confirmed by Dr.\nSchlundt and myself.\nUsing the factor .000150 a/p/s I estimate that the gamma ray test\nmade with Mrs Maddinger facing the table shows the presence of 10 micro-\ngrams of radium. If the old standard were used this would be raised to\n17.8 micrograms. With Mrs Maddingers back to the instrument we estimate\nthe quantity of radio-active material present to be 18.6 micrograms by our\npresent standard or 33.8 by the old standard.\nExpired Air Test.\nThe test on the expired air was made in Room e -420 using the ionization\nchamber marked S.P. 1009.\nThe readings were made with the Lind Electroscope.\nNatural Leake:\n12.45 P.M.\nDiv read\n89\nto 83\n501\n58\"\n00196 d/p/s/.\n1.45 P.M.\n\"\n83\n\" 74\n761\n26\"\n00196 d/p/s/\nMrs Maddinger blew ligivoly her expired air into the ionization chamber\nfor four minutes, the expired air passing through three towers, one containing\nCaCl, a second soda-lime and the last one cotton before entering the cham-\ner itself. a minute was allowed before making readings, altho the fall\nof the leaf was noted to detect the presence of any mesothorium during that\ntime.\n3.20 P.M.\nDiv read\n90\nto\n75\n35°39\"\n00748 d/p/s.\nincrease in fall .00552 d/p/s.\n4.23 ff\n11\n93\nff\n77\n331 50\"\n00874 d/p/s.\nincrease in fall .00688 d/p/s.\n5.20 \"\n\"\n93\n\"\n77\n30' 38\"\n00870 d/p/s.\nincreas\n.00684 d/p/s.\n6.20\n\"\n\"\n97\n!!\n86\n19 13\"\n,00954 d/p/s.\nincrease 00758 d/p/s.\nMy experience does not permit me to give any estimation as to the amount\nof radium this increase in leake represents. It all depends on how the\nradium is deposited in the body and my experiments indicate that this va-\nries with the animal. But taking Dr. Schlundt's method for estimation we\nwould say that the net positive drift in this case indicated 1.50 micro-\ngrams of radium."
}