From: Michael M. Butler (mmb@spies.com)
Date: Mon Dec 09 2002 - 20:28:43 MST
2002-12-07 16:41:57, Jeff Davis <jrd1415@yahoo.com> wrote:
>--- "Robert J. Bradbury" <bradbury@aeiveos.com> wrote:
>>
>> And in some cases it has, e.g. Deinococcus
>> radiodurans. I believe that
>> D. radiodurans can repair up to 300 double strand
>> breaks, most probably
>> through homologous recombination repair pathways (my
>> speculation).
>
>
>Now, of course, most of us have heard of:
>
>Super Survivor Deinococcus radiodurans
>
>http://www.ornl.gov/hgmis/publicat/microbial/image3.html
>
>But the above web piece is a real eye opener. (The
>very first web site on the list when I googled D.
>radiodurans.) It gives a bit more detail than I've
>seen up till now, suggests that the genome has been
>mapped, and generally gets one jazzed about the
>possibilities.
>
>I loved the graph comparing the radiation
>survivability of humans, cockroaches, E. coli, and D.
>radiodurans. At .5 kGy (whatever that means)
Ummm. See below.
>"When older colonies of D. radiodurans are used, their
>survival extends much farther, to around 17kGy (1.7
>million rads)."
<geekmode=FULL>
Well, any metric-savvy person should be able to figure out that a kGy (whatever that means) is a "kilo"-
Gy (whatever a Gy is)--and the quoted text indicates that a Gy is equated to 100 rads. k is for kilo,
check? So .5 kGy is 500 rads, which is indeed roughly the LD-50 for humans in the old tables. Check.
So far so good; that leaves a "Gy" as the mystery unit.
http://hyperphysics.phy-astr.gsu.edu/hbase/nuclear/radrisk.html
seems pretty useful. [Google is your friend]
This site says a Gray is 1 joule of deposited energy per kilogram of tissue. Sounds right to me. Not sure
who this "Gray" is or was, but I bet a persistent person could find out.
Some search terms could be:
ABSORBED DOSE, ABSORBED DOSE INDEX, KERMA & SPECIFIC ENERGY IMPARTED IONISING IONIZING RADIATION
METRIC SYSTEM
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