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I was impressed in looking over the available data by the fact that all of the
girls who have died worked in the plant between the years 1917- I920 and in aone cases
had been away from the plant several years before pathologic conditions appeared. The
question naturally arises a.s to whether there had been any change in the mixture in
the
that period or whether there were other shop conditions or infections present that was
not present in the later years or at other plants,
The luminous paint used in this work consists of 3 apecially prepared zinc sul-
phide mixed with small amounts of Enpuarx thorium-radium and very infintesimal amounts
of copper. The zino uaed is prepared from the best grade of zime supbhi de obtainable
by repeated precipitation. In e radio-active compound is added in a soluable form to an
emulsion of zinc sulphide and precipitated out with an alkalime sulphate with constant
stirring. It is hard to conceive the radium or thorium sulphate formed as being in any
thing but almost colloidal condition which must be admorbed by the zine sulphide. In'
amount
amomut of radium thoriun present varies according to the grade of material required,
but it varies from 0.7 of a milligram to 3 Or 4 milligrems per hundred grams of zinc
sulphide, Then used this material is mixed with an adhesive compound by the girls in a
suall to GC poroslaim crucible with a glaus rod and then thinned out with distilled
water. The girls are rather energetic in their mixing and I have moticed droplets of
the mixture on thoir personw and clothes as well as on the benches. Also in holding
gets
the crucible with one haud during the mixing some of the paint got on the hand used to
hold the container. The girls could be seen touching their hair and other parts of the
body with this hand and it was surprising how luminous these portions of the body became
when
flashed
and
then
observed
in
a
dark
room.
The
aprone
which
the
girla
wore
were
ob-
served
to
shime
all
over
when
returned
from
the
laundry.
We
felt
as
if
the
paint
had
on
been n net il in the washing process. We have never been able to detect any luminousity
any wheres except where actually contact with the paint by means of the brush, hands or
splashing could not expéatnitt.
The girla apply the luminous paint to the dials with small camel hair brushes.
Page data
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- Source index
- 0
- Type
- photo
- Media ID
- b612e8dc63942c64
- Size
- unknown
Document data
- ID
- 75720556
- Core
- doc
- Type
- document
DTO data
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"title": "Report to [A. Roeder], January 28, 1926",
"citationUrl": "https://catalog.archives.gov/id/75720556",
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Context sent to Scholar
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"citationUrl": "https://catalog.archives.gov/id/75720556",
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Page context
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"ocrText": "4\nI was impressed in looking over the available data by the fact that all of the\ngirls who have died worked in the plant between the years 1917- I920 and in aone cases\nhad been away from the plant several years before pathologic conditions appeared. The\nquestion naturally arises a.s to whether there had been any change in the mixture in\nthe\nthat period or whether there were other shop conditions or infections present that was\nnot present in the later years or at other plants,\nThe luminous paint used in this work consists of 3 apecially prepared zinc sul-\nphide mixed with small amounts of Enpuarx thorium-radium and very infintesimal amounts\nof copper. The zino uaed is prepared from the best grade of zime supbhi de obtainable\nby repeated precipitation. In e radio-active compound is added in a soluable form to an\nemulsion of zinc sulphide and precipitated out with an alkalime sulphate with constant\nstirring. It is hard to conceive the radium or thorium sulphate formed as being in any\nthing but almost colloidal condition which must be admorbed by the zine sulphide. In'\namount\namomut of radium thoriun present varies according to the grade of material required,\nbut it varies from 0.7 of a milligram to 3 Or 4 milligrems per hundred grams of zinc\nsulphide, Then used this material is mixed with an adhesive compound by the girls in a\nsuall to GC poroslaim crucible with a glaus rod and then thinned out with distilled\nwater. The girls are rather energetic in their mixing and I have moticed droplets of\nthe mixture on thoir personw and clothes as well as on the benches. Also in holding\ngets\nthe crucible with one haud during the mixing some of the paint got on the hand used to\nhold the container. The girls could be seen touching their hair and other parts of the\nbody with this hand and it was surprising how luminous these portions of the body became\nwhen\nflashed\nand\nthen\nobserved\nin\na\ndark\nroom.\nThe\naprone\nwhich\nthe\ngirla\nwore\nwere\nob-\nserved\nto\nshime\nall\nover\nwhen\nreturned\nfrom\nthe\nlaundry.\nWe\nfelt\nas\nif\nthe\npaint\nhad\non\nbeen n net il in the washing process. We have never been able to detect any luminousity\nany wheres except where actually contact with the paint by means of the brush, hands or\nsplashing could not expéatnitt.\nThe girla apply the luminous paint to the dials with small camel hair brushes."
}