home *** CD-ROM | disk | FTP | other *** search
- Newsgroups: talk.environment
- Path: sparky!uunet!pmafire!russ
- From: russ@pmafire.inel.gov (Russ Brown)
- Message-ID: <1993Jan26.041124.19802@pmafire.inel.gov>
- Date: Tue, 26 Jan 93 04:11:24 GMT
- Organization: WINCO
- Subject: Re: TMI Releases & Population Dose
- Summary:
- References: <Jym.8Jan1993.0930@naughty-peahen> <1993Jan10.232841.22830@pmafire.inel.gov> <Jym.25Jan1993.0237@naughty-peahen>
- Followup-To:
- Organization: WINCO
- Keywords:
- Lines: 62
-
- In article <Jym.25Jan1993.0237@naughty-peahen> Jym Dyer <jym@mica.berkeley.edu> writes:
- >> The central estimate of population dose was about 2000
- >> person-rem for the 541,000 persons living within 50 miles.
- >> This is an average dose of 4 mrem.
- >
- >=o= I presume these numbers come from the Tokuhata studies,
- >since that's the source you keep trotting out. Care to go
- >into detail about how these estimates are made? Care to give
- >any numbers reflecting a variance in dose, rather than some
- >flat average?
-
- Tokuhata (of the Pennsylvania State Department of Health) did an
- epidemiologic study, not a dose measurement.
-
- I will attempt to dredge it out of my time/stack filing system.
- >
- >>> It is well-documented that MetEd does not have measurements
- >>> of the radiation released . . .
- >> There is, of course, a difference between "radiation released"
- >> and "dose". That distinction seems to have eluded Mr. Dyer.
- >
- >=o= The distinction does not elude me at all. What does elude
- >me, though, is how you think you can get away from the fact that
- >"radiation released" somehow has no effect on "dose received."
-
- If you would read the sentence just quoted, you will notice that I
- wrote, "There is, of course, a difference between "radiation released"
- and "dose"...which you, not I, cheerfully translated into "radiation released"
- somehow has no effect on "dose received". To be precise, the
- _radioactivity_ released is related to potential doses when that is
- combined with radionuclide distribution, weather patterns,
- precipitation, and location of persons. The _radiation_ from the TMI
- facility could only have affected the worker population. Radiation and
- radioactivity are different things.
-
- Using the radioactivity released and the above-mentioned (others could
- be considered, too) factors, one could use a model to predict potential
- doses. But direct field measurement using air samplers and other
- detectors provide better estimates. Both were done.
-
- Consider that if the estimate (4 mrem) were 10 times higher, there still
- would be no significant health impacts in the population. Using
- conservative estimators of risk, one might postulate a single health
- effect in the 541,000 population. Bear in mind that this population
- would, during the aggregated lifetimes, have about 119,000 cancer deaths.
- >
- >=o= In fact, the premise that only small amounts of radiation
- >was released (a premise proven false by every independent
- >analysis of the accident) has had a very direct effect on the
- >studies used to estimate the dose received. Since the official
- >amount released was small, Tokuhata saw no point in actually
- >monitoring the health of hundreds of thousands of people.
-
- At the risk of being impolite, this last paragraph (forgiving your
- inability to understand the radiation-radioactivity difference) suggests
- that you do not understand that of which you speak.
-
- BTW, the health data of the area are carefully recorded by the National
- Cancer Institute and are maintained in a database covering the 1950-1990
- period.
-
-
-