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UNIVERSITY OF MISSOURI
COLUMBIA
DEPARTMENT OF CHEMISTRY
October 1, 1928
OCT 3 1928
Mr. H. H. Barker
United States Radium Corporation
535 Pearl Street
New York City.
185 CORP
My dear Howard:
Enclosed herewith is a second, perhaps a
third installment of our report, The Detection of Radium in Living
Persons. Perhaps we shall be obliged to call a temporary halt
for it seems to me that the data in hand on the Scintillation Method
of Detecting Radium or Mesothorium will require a little more ex-
perimenting. Tomorrow or the day after we hope to return to you
two of the spinthariscopes properly fitted with zinc sulfide screens.
I fear that there will still be a little residual alpha radiation,
although we have used considerable care to keep the zinc sulfide away
from high grade material. The magnification of the lens is seven
times and the area of the field covered is a circle about 15 mm in
diameter. We have in process of construction a spinthariscope in
which the lens will be also magnified seven times, but the field
covered will be 28 mm in diameter, the focal length, of course, will
be thereby reduced and it will be necessary to mount the lens outside
the chamber and fix it so that the zinc sulfide will be fastened to
glass through the scintillations can be seen.
which
Our next step will be to conduct a few
experiments on the determination of radium in excreta.
Please advise whether the report up to this
point will be sufficient to guide Dr. Craver and Dr. Fialla in the
tests for radioactivity which are soon to be made on the five patients
now under observation.
With very kind regards, I remain
Sincerely yours,
Herman Schlundt
Jurnder whether the next step should not be
HS
C
b
a few pages about the theory of these measurements 2
Duplicate of thes section of report goes to Do 71
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"ocrText": "UNIVERSITY OF MISSOURI\nCOLUMBIA\nDEPARTMENT OF CHEMISTRY\nOctober 1, 1928\nOCT 3 1928\nMr. H. H. Barker\nUnited States Radium Corporation\n535 Pearl Street\nNew York City.\n185 CORP\nMy dear Howard:\nEnclosed herewith is a second, perhaps a\nthird installment of our report, The Detection of Radium in Living\nPersons. Perhaps we shall be obliged to call a temporary halt\nfor it seems to me that the data in hand on the Scintillation Method\nof Detecting Radium or Mesothorium will require a little more ex-\nperimenting. Tomorrow or the day after we hope to return to you\ntwo of the spinthariscopes properly fitted with zinc sulfide screens.\nI fear that there will still be a little residual alpha radiation,\nalthough we have used considerable care to keep the zinc sulfide away\nfrom high grade material. The magnification of the lens is seven\ntimes and the area of the field covered is a circle about 15 mm in\ndiameter. We have in process of construction a spinthariscope in\nwhich the lens will be also magnified seven times, but the field\ncovered will be 28 mm in diameter, the focal length, of course, will\nbe thereby reduced and it will be necessary to mount the lens outside\nthe chamber and fix it so that the zinc sulfide will be fastened to\nglass through the scintillations can be seen.\nwhich\nOur next step will be to conduct a few\nexperiments on the determination of radium in excreta.\nPlease advise whether the report up to this\npoint will be sufficient to guide Dr. Craver and Dr. Fialla in the\ntests for radioactivity which are soon to be made on the five patients\nnow under observation.\nWith very kind regards, I remain\nSincerely yours,\nHerman Schlundt\nJurnder whether the next step should not be\nHS\nC\nb\na few pages about the theory of these measurements 2\nDuplicate of thes section of report goes to Do 71"
}