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TREASURY DEPARTMENT
UNITED STATES
PUBLIC HEALTH SERVICE
OFFICE OF
INDUSTRIAL HYGIENE
WASHINGTON, D. C.
JUN 11 1929
AND SANITATION
Room 1-123, "C" Bldg.,
16 Seventh St., S. W.
June 10, 1929
Mr. H. H. Barker,
Vice President,
U. S. Radium Corpn.,
535 Pearl St.,
New York, N. Y.
Dear Mr. Barker:
You will recall that in our studies on effect
of radium on workers in watch factories one of the things
we propose to do is to determine the radio active content
of the air in the workrooms. For this purpose we pre-
pose to suck the air through cotton wool and incinerate it
and place the residue inside an ionization chamber and de-
termine the amount of ionization due to it. In connec-
tion with this we have asked Dr. Curtis of the Bureau of
Standards to calibrate the ionization chamber for solids
which we propose to use for this purpose. Question has
arisen as to the best method of calibrating the chamber and
he proposes to calibrate it by placing a known quantity
of radium sulphate in the chamber and determining the
rate of deflection of the leaf for it. Do you think
this would be a satisfactory method of calibrating the
chamber? The reason for using radium sulphate is that
Dr. Curtis says when the radium salts are mixed with the
paint they become converted into radium sulphate and that
this probably is the substance which is present in the dust
in the air. Do you think this is SO? It occurs to me
--2--
it is possible there may be other radio active material
in the air, such as radium chloride or radium bromide or
possibly some forms of thorium. The question I wish to
ask is radium sulphate the best material with which to
calibrate the ionization chamber for solids?
Sincerely yours,
James E. wes
(James E. Ives)
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"ocrText": "TREASURY DEPARTMENT\nUNITED STATES\nPUBLIC HEALTH SERVICE\nOFFICE OF\nINDUSTRIAL HYGIENE\nWASHINGTON, D. C.\nJUN 11 1929\nAND SANITATION\nRoom 1-123, \"C\" Bldg.,\n16 Seventh St., S. W.\nJune 10, 1929\nMr. H. H. Barker,\nVice President,\nU. S. Radium Corpn.,\n535 Pearl St.,\nNew York, N. Y.\nDear Mr. Barker:\nYou will recall that in our studies on effect\nof radium on workers in watch factories one of the things\nwe propose to do is to determine the radio active content\nof the air in the workrooms. For this purpose we pre-\npose to suck the air through cotton wool and incinerate it\nand place the residue inside an ionization chamber and de-\ntermine the amount of ionization due to it. In connec-\ntion with this we have asked Dr. Curtis of the Bureau of\nStandards to calibrate the ionization chamber for solids\nwhich we propose to use for this purpose. Question has\narisen as to the best method of calibrating the chamber and\nhe proposes to calibrate it by placing a known quantity\nof radium sulphate in the chamber and determining the\nrate of deflection of the leaf for it. Do you think\nthis would be a satisfactory method of calibrating the\nchamber? The reason for using radium sulphate is that\nDr. Curtis says when the radium salts are mixed with the\npaint they become converted into radium sulphate and that\nthis probably is the substance which is present in the dust\nin the air. Do you think this is SO? It occurs to me\n--2--\nit is possible there may be other radio active material\nin the air, such as radium chloride or radium bromide or\npossibly some forms of thorium. The question I wish to\nask is radium sulphate the best material with which to\ncalibrate the ionization chamber for solids?\nSincerely yours,\nJames E. wes\n(James E. Ives)"
}