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Letters Received to H.H. Barker, July 16, 1928

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UNIVERSITY OF MISSOURI RECEIVED 18 COLUMBIA DEPARTMENT OF CHEMISTRY RADIUM LUMING Mill July 16, 1928 MATERIAL Mr. H. H. Barker United States Radium Corporation 535 Pearl Street New York, N. Y. My dear Barker: I am sorry that I did not answer sooner your letter about the proposed experiments with Dr. Flinn. I had hardly real- ized that you and Dr. Flinn were arranging your vacation plans pending an answer, for I had written that any date after August fifth would be agreeable to me. I shall drop Dr. Flinn a line today and I hope that he will send me an outline of the proposed experiments so that we may do a little preliminary work here. I may add that the scintillation method of detecting small quantities of radium emanation in expired air does not appear to me as a very sensitive test. At least we have not, thus far, been able to devise any optical arrangements which will make this method more sensitive than the ordinary ionization method. We have a microscope with a very large field such as is used in the Cavendish Laboratory for counting scintillations. It has a field of nine square millimeters, but a very simple calculation will show that the number of scintillations which will fall on this small area, when the expired air under test is contained in a closed vessel, will be ex- ceedingly small. I hope that you will have a fine vacation. Please advise me where you are going so that in case I want to drop you a line in a hurry there will be no delay. With very kind regards, I remain Sincerely yours, Herman Schlundt Herman Schlundt HS/BB

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Source index
0
Type
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Media ID
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Size
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    "ocrText": "UNIVERSITY OF MISSOURI\nRECEIVED 18\nCOLUMBIA\nDEPARTMENT OF CHEMISTRY\nRADIUM LUMING Mill\nJuly 16, 1928\nMATERIAL\nMr. H. H. Barker\nUnited States Radium Corporation\n535 Pearl Street\nNew York, N. Y.\nMy dear Barker:\nI am sorry that I did not answer sooner your letter\nabout the proposed experiments with Dr. Flinn. I had hardly real-\nized that you and Dr. Flinn were arranging your vacation plans\npending an answer, for I had written that any date after August\nfifth would be agreeable to me. I shall drop Dr. Flinn a line\ntoday and I hope that he will send me an outline of the proposed\nexperiments so that we may do a little preliminary work here.\nI may add that the scintillation method of detecting\nsmall quantities of radium emanation in expired air does not appear\nto me as a very sensitive test. At least we have not, thus far,\nbeen able to devise any optical arrangements which will make this\nmethod more sensitive than the ordinary ionization method. We have\na microscope with a very large field such as is used in the Cavendish\nLaboratory for counting scintillations. It has a field of nine\nsquare millimeters, but a very simple calculation will show that the\nnumber of scintillations which will fall on this small area, when the\nexpired air under test is contained in a closed vessel, will be ex-\nceedingly small.\nI hope that you will have a fine vacation. Please\nadvise me where you are going so that in case I want to drop you a\nline in a hurry there will be no delay.\nWith very kind regards, I remain\nSincerely yours,\nHerman Schlundt\nHerman Schlundt\nHS/BB"
}