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Re: MEDHP-SEC: Re: Breast Cancer High in X-ray Techs Before 1950
And note in Figure 12 the wide open Coolidge tube - circa 1913. (Its
nice having a FULL set of the journal!). Like I said - a long
transition.
"Jacobus, John (OD/ORS)" wrote:
>
> Ted,
> I am looking at Figure 11 in the article "X rays in diagnostic radiology" by
> Ed Webster that appeared in the November 1995 issue of Health Physics. It
> shows a "lead-shielded exclosure for an x-ray tube, desgined by H. Rollins
> for F. H. Williams." The article states the Rollins was the first to design
> tube housings to reduce x-ray exposure to the patient and physician.
>
> My impression was that x-ray units was becoming common place in the 1920's
>
> -- John
> John Jacobus, MS
> Certified Health Physicist
> 3050 Traymore Lane
> Bowie, MD 20715-2024
>
> E-mail: jenday1@email.msn.com (H)
>
> -----Original Message-----
> From: Ted de Castro [mailto:tdc@xrayted.com]
> Sent: Wednesday, June 26, 2002 4:25 PM
> To: Grissom, Mike
> Cc: Jacobus, John (OD/ORS); 'Frame, Paul'
> Subject: Re: MEDHP-SEC: Re: Breast Cancer High in X-ray Techs Before
> 1950
>
> Actually - I have a book called "Trail of the Invisible Light" that is
> an excellent historical reference on the subject and also suggests that
> 49 or 50 is when tubes became shielded. By '55 for SURE they looked
> much as many do now.
>
> "Grissom, Mike" wrote:
> >
> > Ted,
> >
> > I believe Howard Andrews, a Public Health Service Officer
> > who was active in the 1930s and 1940s (more or less a
> > contemporary of Dale Trout's), had written a number of
> > papers on x-ray equipment of the era as well. You might
> > be able to find some specific references if your search
> > covers 'very old' journals/magazines!
> >
> > Howard, alas, died a few years ago. He was in his high-90s
> > but could still communicate by mail with us regarding his
> > participation in atmospheric nuclear testing in the
> > 1940s/1950s when I was at the NTPR office in the 1982-1985
> > period.
> >
> > I believe there is an HPS pioneer video on Howard in the
> > system somewhere, perhaps Paul Frame knows the details.
> >
> > S.,
> >
> > MikeG.
> >
> > -----Original Message-----
> > From: Ted de Castro [mailto:tdc@xrayted.com]
> > Sent: Wednesday, June 26, 2002 12:56 PM
> > To: Jacobus, John (OD/ORS)
> > Cc: 'RadSafe'; 'HPS Medical Physic Section'
> > Subject: MEDHP-SEC: Re: Breast Cancer High in X-ray Techs Before 1950
> >
> > 1950 was JUST ABOUT the time the "shock proof" shielded tube housing
> > came to be!
> >
> > Before that it was unshielded glass tubes, aerial HV cables and spark
> > gap regulation.
> >
> > At least that is what I derive from reading articles by Trout dated in
> > the early 50's.
> >
> > Wasn't actually there (or at least not old enough to know anything
> > relevant) so can't say for sure.
> >
> > Maybe some slightly more senior person can add some first hand
> > information.
> >
> > "Jacobus, John (OD/ORS)" wrote:
> > >
> > > I thought this might be of interest.
> > >
> > > -- John
> > > John Jacobus, MS
> > > Certified Health Physicist
> > > 3050 Traymore Lane
> > > Bowie, MD 20715-2024
> > >
> > > E-mail: jenday1@email.msn.com (H)
> > > -------------------------------------------------
> > > Breast Cancer Mortality High in X-Ray Techs Who Worked Before 1950
> > >
> > > NEW YORK (Reuters Health) Jun 19 - Women who worked in the US as
> radiologic
> > > technologists before 1950 have a higher risk of death from breast cancer
> > > compared with women who started working in such jobs in 1960 or later,
> > > according to a report in the June 19th issue of the Journal of the
> National
> > > Cancer Institute.
> > > Dr. Michael Hauptmann from the National Cancer Institute in Bethesda,
> > > Maryland, and colleagues collected data on 65,525 female radiologic
> > > technologists who had been certified in the US between 1926 and 1982.
> > >
> > > The researchers examined deaths from breast cancer and their
> relationship to
> > > the women's work history and practices. They also adjusted the data for
> > > known risk factors.
> > >
> > > The highest risk of death from breast cancer was found among women who
> > > became radiologic technologists before 1940 (relative risk 2.92), and
> > > between 1940 and 1949 (relative risk 2.44), compared with women who
> started
> > > working as radiologic technologists in 1960 or after. After 1960 the
> risk
> > > declined.
> > >
> > > Among women who performed fluoroscopy and multifilm procedures before
> 1950,
> > > there was a significantly increased risk of breast cancer death compared
> > > with women who first performed these procedures in 1960 or after, the
> > > researchers found.
> > >
> > > In a statement, Dr. Hauptmann and colleagues conclude that "the
> increased
> > > risks of dying from breast cancer among radiologic technologists who
> first
> > > worked or worked 5 or more years prior to 1950 were likely due to higher
> > > levels of radiation exposure before 1950, since recommended radiation
> > > exposure limits were dramatically reduced between 1930 and the late
> 1950s."
> > >
> > > J Natl Cancer Inst 2002;94:943-948.
> > >
> > >
> ----------------------------------------------------------------------------
> > > ----
> > >
> > > Reuters Health Information 2002. © 2002 Reuters Ltd
> > >
> > > ************************************************************************
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