Report, February 25, 1932

Columbia Unitrersity Unllege of 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 Feb 25, 1932. The test was made in Room e -430 at the College of Physicians and Surgeons, Columbia University, in the afternoon of February 25, 1932. The conditions under which the examination was made were standard. The lights in the office were all on, the curtain at the window was pulled down to prevent any outside reflection of the sun entering the room, and the door of the room kept shut except when it was necessary to go out or re-enter. Mr. Barker and a lady friend of Mrs Maddingers were seated at a distance of between 15 to 18 feet away from the table where the test was being made. The standards for the electroscope were started at 1 P.M. and the subject did not arrive until 2.30 P.M. Mrs Maddinger was seated in chair in front of a table so adjusted that the top of the table was within half an inch of her lap and the point of the table formed by the right angle of two sides of the table within an inch and a half of her abdomen. The Wulfe-Heas Gamma Ray Electroscope was placed on this point so that a portion of it extended beyond the edge of the table. A piece RE corrugated card board was held by the subject be- tween herself and the bony to act as an insulation against any body effect outside of any radio-active material that might be present in the body. Gamma Ray Test: Natural Leake; 1.00 P.M. Div. read to 45 26° 39" .00312 a/p/s 1.56 P.M. 50 " 44 32°32" ,00307 " Mrs Maddinger in chair as described above 2.40 P.M. Div read 50 to 45 17° 53" ,00466 d/p/s Standard if 50 to 45 26:40" .00318 d/p/s. Mrs Maddinger seat as before 4. P.M. if 50 to 45 18° 16" .00457 d/p/s. Subject was then placed in the chair with her back within two inches of the instrument with the corrugated card board between the body and the electroscope.