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Public Health Reports. Reprint No. 889.
PLATE II.
EXPOSURE TO RADIUM PREPARATIONS.
9
of radium, the distance of the film from the radium, and the time of
exposure were as follows:
10 mg. at 5 cm. for 5 minutes.
25 mg. at 5 cm. for 5 minutes.
IN
50 mg. at 30.5 cm. for 30 minutes.
75 mg. at 40 cm. for 45 minutes.
15 mg. at 60 cm. for 27 hours.
Positive results of exposure were obtained in all films thus used.
A film was exposed at a distance of 60 cm. for 5 minutes before an
open safe containing 500 milligrams of radium. Between the film
and the radium was interposed a one-half-inch lead screen. The
results of this exposure were negative.
A second experiment of wearing films was made. This time the
films were worn on the five locations previously mentioned, by six
persons for three days. During this time they performed their
regular routine work. The amount of radium handled and the length
of exposure during this time varied within the limits named for the
first experiment; that is, from 10 milligrams to 500 milligrams in
amount and from 15 minutes to 21 hours in time. The films from
three persons in this experiment showed positive evidence of exposure
to radiation. The three films that were positive were those worn
Measuring radium by means of the gamma ray electroscope- the standard method used for
upon the forehead.
all but exceedingly weak preparations.
The preceding experiments seemed to show that the forehead was
the most exposed part of the workers, as the films worn on the other
parts of the body were at all times negative; and so in the next ex-
periments with the wearing of the films it was decided that they should
be worn only upon the forehead. The films were now worn by six
persons for four days. The amount of radium to which they were
exposed at this time varied from 10 milligrams to 750 milligrams
daily, and the length of time from five minutes to three hours.
During the time these films were worn, regular routine duties were
performed. All the films used in this experiment showed positive
evidence of exposure to radiation.
It would therefore seem, from the results obtained from the wearing
of films as above described, that employees of the radium section in
the course of their regular routine work receive sufficient radiation
to record positive findings upon the dental X-ray films. It would
also appear that the head is the part of the body that is exposed to
the greatest amount of radiation, except, of course, the hands and
forearms.
Having thus considered the possible hazard of exposure to radiation
in the work process of the group of persons under discussion, and
having further established by experiments that all members of the
group receive upon at least one part of the body (the forehead)
sufficient radintion to produce positive evidence of exposure on dental
Making measurements of length, diameter, and weight of radium tubes, needles. and plaques
for nurnoses of future identification.
81180 24
2
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"ocrText": "Public Health Reports. Reprint No. 889.\nPLATE II.\nEXPOSURE TO RADIUM PREPARATIONS.\n9\nof radium, the distance of the film from the radium, and the time of\nexposure were as follows:\n10 mg. at 5 cm. for 5 minutes.\n25 mg. at 5 cm. for 5 minutes.\nIN\n50 mg. at 30.5 cm. for 30 minutes.\n75 mg. at 40 cm. for 45 minutes.\n15 mg. at 60 cm. for 27 hours.\nPositive results of exposure were obtained in all films thus used.\nA film was exposed at a distance of 60 cm. for 5 minutes before an\nopen safe containing 500 milligrams of radium. Between the film\nand the radium was interposed a one-half-inch lead screen. The\nresults of this exposure were negative.\nA second experiment of wearing films was made. This time the\nfilms were worn on the five locations previously mentioned, by six\npersons for three days. During this time they performed their\nregular routine work. The amount of radium handled and the length\nof exposure during this time varied within the limits named for the\nfirst experiment; that is, from 10 milligrams to 500 milligrams in\namount and from 15 minutes to 21 hours in time. The films from\nthree persons in this experiment showed positive evidence of exposure\nto radiation. The three films that were positive were those worn\nMeasuring radium by means of the gamma ray electroscope- the standard method used for\nupon the forehead.\nall but exceedingly weak preparations.\nThe preceding experiments seemed to show that the forehead was\nthe most exposed part of the workers, as the films worn on the other\nparts of the body were at all times negative; and so in the next ex-\nperiments with the wearing of the films it was decided that they should\nbe worn only upon the forehead. The films were now worn by six\npersons for four days. The amount of radium to which they were\nexposed at this time varied from 10 milligrams to 750 milligrams\ndaily, and the length of time from five minutes to three hours.\nDuring the time these films were worn, regular routine duties were\nperformed. All the films used in this experiment showed positive\nevidence of exposure to radiation.\nIt would therefore seem, from the results obtained from the wearing\nof films as above described, that employees of the radium section in\nthe course of their regular routine work receive sufficient radiation\nto record positive findings upon the dental X-ray films. It would\nalso appear that the head is the part of the body that is exposed to\nthe greatest amount of radiation, except, of course, the hands and\nforearms.\nHaving thus considered the possible hazard of exposure to radiation\nin the work process of the group of persons under discussion, and\nhaving further established by experiments that all members of the\ngroup receive upon at least one part of the body (the forehead)\nsufficient radintion to produce positive evidence of exposure on dental\nMaking measurements of length, diameter, and weight of radium tubes, needles. and plaques\nfor nurnoses of future identification.\n81180 24\n2"
}