HomeRoast Digest


Topic: [OT] Healthy Zoomies (was Radiative Roasting) (13 msgs / 412 lines)
1) From: Steve Hay
On 4/9/06, Aaron  wrote:
<Snip>
Actually, I may have misspoken that Cherenkov radiation is gamma radiation
per se, because I think that distinction falls specifically to that which
results from nuclear decay.  Cherenkov radiation is E-M radiation caused by
the sudden deceleration of particles when they reach a medium for which the=
y
would be exceeding the speed of light.  For a nuclear reactor, this can
sometimes be seen as a blue glow when the particles leave the metal and
reach the water, causing them to instantaneously decelerate and emit E-M
energy.  This looks really cool by the way; its an eerie blue glow.
I'm not sure if any of the radiation particles can be considered
better/worse than another.  Beta radiation (electrons and positrons) are
shielded by clothes and alpha radiation (helium nuclei) is shielded by skin=
,
which is good.  However, eating an alpha/beta source can be pretty damaging
though because the energy is dissipated in a more concentrated area in your
GI tract for example.  But cooking something with any of these wouldn't
really do anything to the food itself but heat it up...  Neutrons would be =
a
different story because they might activate something in the food and make
the food a source itself.
--
Homer Simpson
hay.steve -AT- gmail.com
Barry Paradox: Consider k to be the greatest element of the set of natural
numbers whose description require maximum of 50 words: "(k+1) is a natural
number which requires more than 50 words to describe it."

2) From: Aaron
But that's the thing steve.
alpha and beta, are technically particles... ie matter.... you probably 
could not cook very well with them without them actually touching the 
food, ... which would leave umm err...'halflife' behind....
gamma is energy, ie a ray, so would not leave a particle to be 
ingested.  but given it's penetration power... would it even slow down 
enough in the food to actually impart any significant heat?
lets just use them to heat the sodium in the primary coolant loop, and 
run the sodium around a cast iron pot to heat the pot to transfer the 
heat to the beans.... the iron will also shield the beans from the 
particle radiation as well...
so ok yep... nuke reactor works just great......  now to find the phone 
number to GE's spent fuels division
Aaron

3) From: J.W.Bullfrog
Aaron wrote:
<Snip>
I don't think that any of the fast breeders are working any more. Man, a 
liquid sodium loop is a tricky thing to handle. Its got this thing for 
water.....
<Snip>
-- 
There is a theory which states that if ever anyone discovers 
exactly what the Universe is for and why it is here, it will 
instantly disappear and be replaced by something even more 
bizarre and inexplicable.
There is another theory which states that this has already happened.

4) From: Scott Marquardt
No, no no. Not good. You're back to conductive heat.
LOL
Rube Goldberg for the nuclear age. Gotta love it.
On 4/9/06, Aaron  wrote:
<Snip>

5) From: Steve Hay
On 4/9/06, Aaron  wrote:
<Snip>
An alpha particle is only a highly energetic helium nucleus.  Once it slows
down, its just an inert helium atom.  Positrons don't last very long becaus=
e
they are antimatter and electrons, well.. they aren't a big deal either.
However, I do agree that alphas and betas would are not very good cooks.
Since they aren't very penetrative, so the middle wouldn't get done!  They
might be good in a toaster oven though...
--
Steven Hay
hay.steve -AT- gmail.com
Barry Paradox: Consider k to be the greatest element of the set of natural
numbers whose description require maximum of 50 words: "(k+1) is a natural
number which requires more than 50 words to describe it."

6) From: Richard Hoffbeck
Steve Hay wrote:
<Snip>
You're right about alpha particles being uninteresting, but electrons 
are a real big deal. Beta particles, either directly or from gamma or 
x-ray radiation knocking an electron loose, form the basis for radiation 
induced mutations and cancer.
--rick

7) From: Steve Hay
On 4/10/06, Richard Hoffbeck  wrote:
<Snip>
Sure, but just like alphas, once they've lost their energy (which happens
with betas when they hit a piece of paper or clothing), they are no longer
interesting...
--
Steven Hay
hay.steve -AT- gmail.com

8) From: Aaron
I thought beta could penetrate paper.   From what I remember,  alpha 
will only travel a few inches in air anyways and can be stopped by 
paper.  beta, can travel a bit further, and can be stopped by wood, or a 
sheet of metal.  gamma, well, you are nothing in it's path when it is 
really charged up.
alpha will be stopped AT the skin surface, ie at the dead skin cells 
layer and can be washed off easily.
beta can penetrate biological material (skin/flesh) to about 5mm and 
this can cause burns,
Let's also not forget, there are two types of radiation,  Ionizing, and 
Non Ionizing.   NI radiation includes some uv, ir and visible light.  It 
also includes microwave radiation,  radar and any radiation generally in 
the range we call 'radio waves'.
Ionizing radiation now is basically any radiation that is energetic 
enough to remove an electron from an atom.  This will create an ion, 
hence the term.  Ionizing radiation would consist of  cosmic rays, 
x-rays, gamma rays, and while they are not energy, alpha and beta particles.
Obviously it's the ionizing radiation we are most worried about because 
this can cause damage from either the heat of its creating/decay or 
carninogenic properties from it's altering of living cells.
Radiation is found in pretty much EVERYTHING.  From the air we breathe 
(radon) to the food we eat (potassium) to the water we drink (tritium).
As an interesting side note to all of this
The rate of decay of radioactive atoms (or radioactivity) in any 
material is measured in Becquerels - named after Henri Becquerel, who 
discovered radioactivity more than 100 years ago. One Becquerel is 
equivalent to one atom decaying every second - about what you would 
expect to find in a gram of coffee. 
http://www.awe.co.uk/main_site/scientific_and_technical/Factsheets/URR/index.html)So for those who drink a lot of coffee, guess what?
Aaron

9) From: Michael Dhabolt
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10) From: Aaron
Michael, yes I have been doing some studying.  This topic got my 
interest and I wanted to comment on an earlier post so figured I better 
put my $%^ all in one sock before I speak up, lest I be lableled a 
troll...  (well ok a bigger troll than I am labeled now heee)
For what it's worth, I used to work around nukes in the Navy so made it 
a habit to learn all I could about radiation.  I do find it interesting 
that the moment anyone says nuclear bomb, immediately probably 99 
percent of the population says plutonium, uranium...when in theory, any 
radioactive material, can be brought to critical mass.  It's not the 
mass that is important really, it's the timing.... anyways.....
Yes there are beta's that are pretty 'hard', but I didn't want to get 
too geeked in my post and start confusing folks.  That is another issue 
one will find a lot of.  many people have no clue as to the difference 
between Ionizing and Non Ionizing radiation and will oft cause an 
uninformed 'panic' over oh say, microwave radiation, like from cell 
phones, when they really have no clue as to how any of it works.
Also for what it's worth.  Alpha travells pretty much in a straight 
line, but as I said earlier, is stopped easily just a few inches through 
air or skin, or.. pretty much anything.  It's a fat slow moving particle.
beta now is more of a 'spread' or 'scatter' pattern in it's emmission, 
it can cover more area. and can penetrate a bit harder.  Yes there are 
some betas that are pretty fierce.  Picture a baseball if you will.  
some are thrown by a flubber arm like me, others are thrown by nolan 
ryan who can do a 100+ MPH fast ball.
Im my opinion Beta under normal circumstances is the most damaging 
radiation there is.  Alpha will get stopped at the surface of your 
skin.  Beta will get into you and THEN stop.   This means that all that 
energy you mentioned to 'accelerate' this thing is now absorbed by your 
body.  you will end up with burns etc, and since it is 'under the skin' 
you can't just jump in the shower with the brillo pad and clean it off 
either.
Gamma now, as said earlier is a .. well.. super charged radio wave for 
lack of a better explanation, it is energy, not a particle ie mass to 
it, in a conventional sense.  Being such gamma can be as strong or as 
weak as it's source emits.  Think of the strength of gamma as like a 
voltage.  You can have low voltage, or you can have a super high 
voltage, as in a power plants transmission lines.
BTW I got some really cool movies of a 500Kv interrupter/breaker failing 
if you are interested.
You mentioned that these beta's are being more and more of a concern to 
the radiological field of medicine.  I believe that as the years go on 
and we learn more, you will find more and more stuff becoming an 'area 
of concern'
This is really wild what I am going to tell you next.
My dad used to work for a paint company LONG ago,  Martin Senour 
Paints.... we are talking back in the 40's 50's.  anyways, one of their 
campaigns was.. they gave out pencils...  in the top of the pencil, it 
was a clear plastic tube with powder in it.   The pencil said on it's 
shank.... Actual sample of uranium ore.... the start of atomic 
power..... plugging the tube was the rubber eraser.  
Anyways, this was a no sh***er sample of uranium ore.  I remember 
bringing one to high school one day in my honors chemistry class, and we 
opened the thing up, and poured a few grains into a cloud chamber, 
crudely made with plastic dishes, and a bowl of CO2 ice, anyways... yep 
this thing was really spitting alpha's and some beta's in there... some 
of the beta's popped fairly hard they did.  I have a couple gross of 
these pencils somewhere, i have to remember where I ended up storing 
them.  My point being here, back then we knew pretty much nothing about 
radiation and elements etc.  They put the stuff in a friggin pencil for 
gods sake.   Can you imagine something like that today?  OMG every tree 
hugger within 10000 miles would be protesting!!  As time goes on, I am 
sure you will see some more umm... guidances... concerning radiation..
As for the X ray aspect of it, yes the very nature of the machine will 
expose folks to x rays.....  the rotating berrylium element will scatter 
some, but in reality, probably close to 90 percent of the energy hitting 
it is dissipated as heat.  The beta's I dont see as much of an issue for 
the operator of the machine so much, they are hiding behind the panel, 
but possibly the person being x rayed, as since beta's tend to 'spray' 
and are not a tight beam like the x rays are directed... they can miss 
the lead apron and go places not intended.
Ok, I went on long enough here.   thank you for your reply Michael, I 
really enjoy when I can have a fairly intelligent conversation with 
someone... even though it is OT and yes we will probably suffer the 
frownings of the puritans on the list.
Take care everyone.
Aaron

11) From: Steve Hay
On 4/11/06, Michael Dhabolt  wrote:
<Snip>
That doesn't surprise me much that Betas in particular are being looked at
more carefully.  I misspoke that betas could be shielded by paper.  Still,
one good thing about both alphas and betas is that alphas and betas both ar=
e
pretty easy to shield, so people tend to care most about gammas for things
like shield design and the others only enter into the picture in a nuclear
reactor if maintenance or something is being done.
Still, I don't believe there would be any problem with using betas to cook
anything ( as long as its not your body ) because the thing you are cooking
isn't going to give you cancer when you eat it just because it was exposed
to beta/alpha...  Am I missing a key point here?
I prefer the unit Curie instead of Becquerels because it makes the
radioactivity seem so much more small..
--
Steven Hay
hay.steve -AT- gmail.com
Barry Paradox: Consider k to be the greatest element of the set of natural
numbers whose description require maximum of 50 words: "(k+1) is a natural
number which requires more than 50 words to describe it."

12) From: Michael Dhabolt
Steve,
<Snip>
No - you're not.
Mike (just plain)

13) From: Richard Hoffbeck
Aaron wrote:
<Snip>
In the current model of radiation induced cancer initiation, betas are 
pretty much the whole game. As they move around they produce single and 
double strand breaks in DNA which the body has to repair. That said, the 
general consensus is that radiation is a strong mutagen but a poor 
carcinogen. We evolved in relatively high background radiation so the 
body is pretty good about repairing the type of damage produced by free 
radicals. There are groups who have built 'guns' that can fire single 
electrons into a single targeted cell that should provide a lot more 
detail on what goes on in a cell when its hit with a beta particle.
If you look at the long-term follow-up studies like the A-bomb survivor 
study in Japan or Chernobyl there isn't much there, and if you look at 
badge dose data for today's radiation workers they'll get higher 
exposures from natural sources like gamma/x-rays from the sun than they 
experience at work. BTW, the occupation with the highest radiation 
exposure these days are airline crews.
<Snip>
In the 40's and 50's radiation was the new wonder drug. It was routinely 
used to treat things like eczema and ringworm. Stuff that would make us 
cringe today. Although, keep in mind that Tesla like to read with an 
open x-ray source behind him because he said "it made his brain feel 
warm" and he died from a stroke at 88.
<Snip>
I work on a study that tracks the health of a large cohort of rad techs. 
Prior to the latest 10-year follow-up survey we conducted a focus group 
to make sure the questions would adequately capture the exposure 
histories of the oldest, and presumably highest exposed, members of the 
cohort. Some of their stories were absolutely mind boggling - like the 
broken window in a control booth that was replaced with standard glass 
instead of leaded glass. The mistake was found 10 years later when they 
tore the room apart to upgrade the equipment.
--rick


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