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Nov. 2, 1938.
Dr. L. F. Curtiss,
Bureau of Standards,
Washington, D. C.
Dear Dr. Curtiss:
I think you will be interested in learning of what
we discovered on the various floors here last Monday, which un-
doubtedly explains to a large extent your difficulty in making
satisfactory nessurements of gamma activity.
Tie checked all the traps in the drainage lines and
found nothing of interest. However, on the sixth floor in the
machine shop we discovered three boxes of waste which show an
activity of approximately 3 milligrans. None of us here knew
of the existence of this serap. According to the statement by
the nechanic in charge of the machine shop, our late Mr. Barker
stored it there temporarily only a few weoks before he left the
office for the Hospital. These boxes were within eight or nine
feet of your instrunent whon you attempted to make tests in the
paper storage roon on the sixth floor, and the only intervening
wall is of thin wood construction. or course, in the laboratory
and around the freight elevator, also in the hall, you had a little
greater distance, and a heavy permenent constructed hollow tile wall,
which undoubtedly gave some scroenage
On the tenth floor, even though we thought extrone care
had been used in removing all activity, we discovered a package of
painted dials on the opening table noar the office and mechanical
shop that contained app oximately 1/4 milligran activity. Since
your instrument is so delicate, this no doubt had somo influence on
your readings in that section of the application roome
You will be pleased to know that the luminous material
cabinet in the weighing room which was discovered to be radioactive
has been replaced with an all-metal cabinet.
In addition to the ultra-violet light which we propose
to use for detecting any possible dust settlings from the luminous
material or any which may attach to the person of the operator, we
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"ocrText": "Nov. 2, 1938.\nDr. L. F. Curtiss,\nBureau of Standards,\nWashington, D. C.\nDear Dr. Curtiss:\nI think you will be interested in learning of what\nwe discovered on the various floors here last Monday, which un-\ndoubtedly explains to a large extent your difficulty in making\nsatisfactory nessurements of gamma activity.\nTie checked all the traps in the drainage lines and\nfound nothing of interest. However, on the sixth floor in the\nmachine shop we discovered three boxes of waste which show an\nactivity of approximately 3 milligrans. None of us here knew\nof the existence of this serap. According to the statement by\nthe nechanic in charge of the machine shop, our late Mr. Barker\nstored it there temporarily only a few weoks before he left the\noffice for the Hospital. These boxes were within eight or nine\nfeet of your instrunent whon you attempted to make tests in the\npaper storage roon on the sixth floor, and the only intervening\nwall is of thin wood construction. or course, in the laboratory\nand around the freight elevator, also in the hall, you had a little\ngreater distance, and a heavy permenent constructed hollow tile wall,\nwhich undoubtedly gave some scroenage\nOn the tenth floor, even though we thought extrone care\nhad been used in removing all activity, we discovered a package of\npainted dials on the opening table noar the office and mechanical\nshop that contained app oximately 1/4 milligran activity. Since\nyour instrument is so delicate, this no doubt had somo influence on\nyour readings in that section of the application roome\nYou will be pleased to know that the luminous material\ncabinet in the weighing room which was discovered to be radioactive\nhas been replaced with an all-metal cabinet.\nIn addition to the ultra-violet light which we propose\nto use for detecting any possible dust settlings from the luminous\nmaterial or any which may attach to the person of the operator, we"
}