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January 29th,1929.
Dr. Herman Schlundt,
University of Missouri,
Columbia, Mo.
Dear Dr. Schlundt:
Mr. Eilert, of the Vitalray Radium Corporation
of America, left with me last week one of the packs used in
his pads, which he stated was supposed to contain 10 micrograms
of radium element.
These packs were made up of material where the
ratio of radium to zinc sulphide was 450 micrograms to 90 grams.
He first conducted a gamma ray test with the
pack and indications were that it contained approximately five
micrograms, after which we ignited and found the net of the
residue to be 1.2 grams.
Inasmuch as Mr. Eilert should have
had 2 grams of zinc sulphide for the pack to contain 10 micgograms
I was more or less inclined to feel that the gamma ray readings
were essentially correct - however, we proceeded with an emenation
determination on the residue, and found the total radium content
of the pack, by this method, to be 4.4 micrograms.
I thought you would be interested in this
information in connection with the work which you are doing on the
analysis of Mr. Eilert's pads.
Sincerely yours,
HHBarker:RH
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"ocrText": "January 29th,1929.\nDr. Herman Schlundt,\nUniversity of Missouri,\nColumbia, Mo.\nDear Dr. Schlundt:\nMr. Eilert, of the Vitalray Radium Corporation\nof America, left with me last week one of the packs used in\nhis pads, which he stated was supposed to contain 10 micrograms\nof radium element.\nThese packs were made up of material where the\nratio of radium to zinc sulphide was 450 micrograms to 90 grams.\nHe first conducted a gamma ray test with the\npack and indications were that it contained approximately five\nmicrograms, after which we ignited and found the net of the\nresidue to be 1.2 grams.\nInasmuch as Mr. Eilert should have\nhad 2 grams of zinc sulphide for the pack to contain 10 micgograms\nI was more or less inclined to feel that the gamma ray readings\nwere essentially correct - however, we proceeded with an emenation\ndetermination on the residue, and found the total radium content\nof the pack, by this method, to be 4.4 micrograms.\nI thought you would be interested in this\ninformation in connection with the work which you are doing on the\nanalysis of Mr. Eilert's pads.\nSincerely yours,\nHHBarker:RH"
}