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    "id": "75730982",
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    "contentType": "document",
    "title": "Report, no date",
    "citationUrl": "https://catalog.archives.gov/id/75730982",
    "collections": [
        "Safety Light Collection",
        "Records Related to Radium Dial Painters"
    ],
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{
    "seq": 4,
    "pageIndex": 0,
    "type": "photo",
    "url": "https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/SLC/Radium/SLC_0003761_Page_04.jpg",
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    "ocrText": "-2-\nAfter experimenting with several modes of setting up the electroscope with\n4\nreference to subject under test, the arrangement shown in the accompanying photo-\ngraph was adopted. It is seen that the subject is sested in a chair with back\ntoward table on which the instrument, a Wulf quartz fiber electroscone, stands\nthen anum class program to turimar\nclose to the middle of the back of the subject. Before seating the subject a\nblank test is made which consists in noting the time required for the charged\nfibers to drift over ten subdivisions of the scale in the ayepiece of the reading\nmicroscope firmly attached to the ionization chamber in which are mounted the quartz\nfibers. This natural drift will vary with weather conditions but as a rule it\nwill take from 20 to 40 minutes for one of the fibers to drift over 10 subdivi-\nsions of the scale. The electroscope is then recharged to the same potential\nby means of a battery of dry cells or a vulcanite charging rod or more conveniently\nstill, a Zamboni dry pile. The time it takes the fiber to drift over the same 10\nsubdivisions of the soale is then recorded with a stop watche\nThe patient is\nthen excused and the natural drift of the instrument is taken again over the same\n10 subdivisions of the scale. The natural drift taken after the test on the sub-\nject must be practically identical with the drift taken before the subject was test-\ned.\nThe making of blank tests immediately before and after testing the subject\nis a suro way of detecting an erratic behavior of the electroscope, which it\nmay be said occurs but rarely when precautions are taken against jarring the in-\nstrument in seating the patient.\nHere is a typical set of readings:\nNatural drift, scale readings 60 to 50, in 23°-44\", = 0.00702 divl per sec.\nDrift, subject under test in chair, 60-50, in = 0.01845 div. per sec.\nDrift, subject under test in chair, 60-50, in 9°-6\" = 0.01831 div. per sece\nNatural drift scale readings 60-50 in 23'-55\" =\n0.00697 div. per sec.\nAverage of natural drifts = 0.00700 dive per sec.\nAverage of observed drifts on patient=0.01838 div. per sec.\nIn crease in drift\n-0.01138 div. per sec.\nWe shall see later that this increase in the, ischarge of the electroscope repre-\nrate of\nK\n126\nsents the presence in the subject of approximately 130 micrograms of radium element."
}