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Cohmbia University
College of Physicians and Surgeons
EPIDEMIOLOGY
INDUSTRIAL HYGIENE
632 WEST 168TH STREET, NEW YORK
PUBLIC HEALTH ADMINISTRATION
INSTITUTE OF PUBLIC HEALTH
SANITARY SCIENCE
Report of Electroscopic Test Made on Mrs Nettie Maddinger
on April 6 1932.
The test was made in Room C-430 at the College of Physicians and
Surgeons, Columbia University during the morning of April 8, 1932.
The conditions under which the examination ware made were standard.
A lady friend of Mrs Maddinger was present during the examination.
Gamma Ray Test:
Natural Leake before test 0.00287 div per sec.
Mrs Maddinger with her back to instrument
1st test 51 to 46 26' 5"
Average leake 0.00319 div per sec.
2nd test 50 " 45 26' 3"
Natural leake after test
51 to 46 28' 20" 0.00296 div per sec
which gives an increase leake for Mrs Maddinger of 0.00029 div perssec.
Mrs Maddinger with instrument in front.
50 to 45 25: 45" 0.00323 div per sec.
Natural Leake
51 to 46 28' 45" 0.00289 div per sec
which gives an increase leake when the test is made with the instrument
in front of 0.00031 div per sec.
Using our old factor the average of the two tests indicate the presence
of approximately 2.5 micrograms of radium.
The expired air test indicate the presence of approximately 1.2 micro-
gram of radium. This would give a combined radium contents of3.7 mico-
grams.
Findench B.W.lm.
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"ocrText": "Cohmbia University\nCollege of Physicians and Surgeons\nEPIDEMIOLOGY\nINDUSTRIAL HYGIENE\n632 WEST 168TH STREET, NEW YORK\nPUBLIC HEALTH ADMINISTRATION\nINSTITUTE OF PUBLIC HEALTH\nSANITARY SCIENCE\nReport of Electroscopic Test Made on Mrs Nettie Maddinger\non April 6 1932.\nThe test was made in Room C-430 at the College of Physicians and\nSurgeons, Columbia University during the morning of April 8, 1932.\nThe conditions under which the examination ware made were standard.\nA lady friend of Mrs Maddinger was present during the examination.\nGamma Ray Test:\nNatural Leake before test 0.00287 div per sec.\nMrs Maddinger with her back to instrument\n1st test 51 to 46 26' 5\"\nAverage leake 0.00319 div per sec.\n2nd test 50 \" 45 26' 3\"\nNatural leake after test\n51 to 46 28' 20\" 0.00296 div per sec\nwhich gives an increase leake for Mrs Maddinger of 0.00029 div perssec.\nMrs Maddinger with instrument in front.\n50 to 45 25: 45\" 0.00323 div per sec.\nNatural Leake\n51 to 46 28' 45\" 0.00289 div per sec\nwhich gives an increase leake when the test is made with the instrument\nin front of 0.00031 div per sec.\nUsing our old factor the average of the two tests indicate the presence\nof approximately 2.5 micrograms of radium.\nThe expired air test indicate the presence of approximately 1.2 micro-\ngram of radium. This would give a combined radium contents of3.7 mico-\ngrams.\nFindench B.W.lm."
}