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Re: MEDHP-SEC: Re: Breast Cancer High in X-ray Techs Before1950
I think your dates are in error by more than 20 years. I started
in 1952; shielded tubeheads had been around for a number of years
at that time. However beam collimation was almost nonexistent
before the late fifties to early sixties. Diagnostic x-ray
frequently exposed virtually the entire body of the patient to the
primary beam. Collimation has continued to improve ever since.
--On Wednesday, June 26, 2002 12:55 PM -0700 Ted de Castro
<tdc@xrayted.com> wrote:
> 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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***********************************************************
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