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OCR Page 1 of 11TESTS FOR RADIOACTIVITY IN MISS GRACE FREYER; MRS. HUSSMAN, MRS. LARICE,
MRS. MCDONALD, MISS SCHAUB
FORMER EMPLOYEES OF THE
UNITED STATES RADIUM CORPORATION
The object of the tests was to detect radioactivity radium, mesothorium) in the
persons named in the title of this report. The tests were conducted jointly by Dr.
G. Failla, Chief Physicist, Memorial Hospital, New York, and myself, in Rooms 801 and
802, Hotel Marseilles, Broadway and 103rd Streets, New York, on Monday, Tuesday, and
Wednesday, November 19-21, 1928. Two members of the Commission named to study the
condition of the subjects were present at times during the progress of the tests.
Dr. Craber was present during the greater part of the day on Tuesday, and Dr. Ewing
witnessed the tests Tuesday afternoon and for a short time Wednesday afternoon. Dr.
Craber also attended for several short periods on Wednesday.
The subjects had been tested previously for radioactivity in the office of Dr.
Martland, City Hospital, Newark, New Jersey, Sunday, April 22, 1928, by Dr. Flinn and
Dr. Schlundt, and found to be inactive. It may be stated here in advance of experimen-
tal data, that the recent tests conducted by Dr. Failla and Dr. Schlundt showed positive
results. Each of the subjects was found distinctly radioactive by both the gamma ray
method and the expired air method of detecting radioactivity in living persons.
The
tests conducted in April in Newark were confined to gamma ray measurements made with a
Wulf quartz fiber electroscope as modified by Hess. The same instrument was used in
the second series of tests conducted by Dr. Failla and myself. The tests on the ex-
pired air of subjects were carried out independently by two methods. Qualitative
tests were made by Dr. Failla with a new type of testing apparatus for detecting feeble
ionization currents. The apparatus is a special type described by Dr. Failla. Both
qualitative and quantitative determinations were made by Schlundt who employed a Lind
type
of electrometer whose ionization chamber had a volume of about 3 liters (2700 cc).
For quantitative determination, the instrument had been calibrated beforehand by Mr.
H. H. Barker. A drift of the leaf of one subdivision of the scale per second represents
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