""Jesper Ørsted"" <shefan@hotmail.com> skrev i en meddelelse
news:1kayif8.u3nluu2bl7k0N%shefan@hotmail.com...
> Jan Rasmussen <invalid@invalid.com> wrote:
>
>> ""Jesper Ørsted"" <shefan@hotmail.com> skrev i en meddelelse
>> news:1kay124.192u3uu1fq6ycoN%shefan@hotmail.com...
>>
>> 11. Neutrino radiation from nuclear power plants(NPP)
>>
http://www.scribd.com/doc/49587116/neutrino-paper
>>
>> Today, it is generally assumed that the 200 or 250 MW of neutrino
>> radiation from an NPP just penetrates all material, without leaving a
>> trace at all. The energy just seems to disappear into the void.
>
> Neutrinoer afgiver ingen energi når de går igennem et menneske, de
> interagerer slet ikke med cellerne i kroppen og er derfor totalt
> uskadelige.
Ja det er rigtigt, set med videnskabelige 2011 briller, men
sætninger som denne: "If neutrinos are the culprits, it means
we are falling terribly short of understanding the true nature of
these subatomic particles." fra nedenstående artikel, lyder derimod
ikke som om vi har helt styr på dem i nu. Og hvad nu med de kollisioner
af anti-neutrinos fra en reaktor der kollidere med solar-neutrinos, som
man må gå ud fra vil forgår i nærheden af et atomkraftværk.
What happens in neutrino antineutrino annihilation ?
"The two particles meet at a single point and annihilate each other,
producing a virtual Z boson, which is the neutral (i.e. no electric charge)
carrier of the weak nuclear force. This Z boson then immediately decays
to produce another particle/antiparticle pair, either a new pair of neutrinos,
two charged leptons, or a quark/antiquark pair.What you can produce depends
on how much energy there is from the colliding neutrinos"
http://news.discovery.com/space/is-the-sun-emitting-a-mystery-particle.html
Is the Sun Emitting a Mystery Particle?
Analysis by Ian O'Neill - Wed Aug 25, 2010
When probing the deepest reaches of the Cosmos or magnifying our
understanding of the quantum world, a whole host of mysteries present
themselves. This is to be expected when pushing our knowledge of the
Universe to the limit.
But what if a well-known -- and apparently constant -- characteristic of
matter starts behaving mysteriously?
This is exactly what has been noticed in recent years; the decay rates
of radioactive elements are changing. This is especially mysterious as
we are talking about elements with "constant" decay rates -- these
values aren't supposed to change. School textbooks teach us this from an
early age.
This is the conclusion that researchers from Stanford and Purdue
University have arrived at, but the only explanation they have is even
weirder than the phenomenon itself: The sun might be emitting a
previously unknown particle that is meddling with the decay rates of
matter. Or, at the very least, we are seeing some new physics.
Many fields of science depend on measuring constant decay rates. For
example, to accurately date ancient artifacts, archaeologists measure
the quantity of carbon-14 found inside organic samples at dig sites.
This is a technique known as carbon dating.
Carbon-14 has a very defined half-life of 5730 years; i.e. it takes
5,730 years for half of a sample of carbon-14 to radioactively decay
into stable nitrogen-14. Through spectroscopic analysis of the ancient
organic sample, by finding out what proportion of carbon-14 remains, we
can accurately calculate how old it is.
But as you can see, carbon dating makes one huge assumption: radioactive
decay rates remain constant and always have been constant. If this new
finding is proven to be correct, even if the impact is small, it will
throw the science community into a spin.
Interestingly, researchers at Purdue first noticed something awry when
they were using radioactive samples for random number generation. Each
decay event occurs randomly (hence the white noise you'd hear from a
Geiger counter), so radioactive samples provide a non-biased random
number generator.
However, when they compared their measurements with other scientists'
work, the values of the published decay rates were not the same. In
fact, after further research they found that not only were they not
constant, but they'd vary with the seasons. Decay rates would slightly
decrease during the summer and increase during the winter.
Experimental error and environmental conditions have all been ruled out
-- the decay rates are changing throughout the year in a predictable
pattern. And there seems to be only one answer.
As the Earth is closer to the sun during the winter months in the
Northern Hemisphere (our planet's orbit is slightly eccentric, or
elongated), could the sun be influencing decay rates?
In another moment of weirdness, Purdue nuclear engineer Jere Jenkins
noticed an inexplicable drop in the decay rate of manganese-54 when he
was testing it one night in 2006. It so happened that this drop occurred
just over a day before a large flare erupted on the sun.
Did the sun somehow communicate with the manganese-54 sample? If it did,
something from the sun would have had to travel through the Earth (as
the sample was on the far side of our planet from the sun at the time)
unhindered.
The sun link was made even stronger when Peter Sturrock, Stanford
professor emeritus of applied physics, suggested that the Purdue
scientists look for other recurring patterns in decay rates. As an
expert of the inner workings of the sun, Sturrock had a hunch that solar
neutrinos might hold the key to this mystery.
Sure enough, the researchers noticed the decay rates vary repeatedly
every 33 days -- a period of time that matches the rotational period of
the core of the sun. The solar core is the source of solar neutrinos.
It may all sound rather circumstantial, but these threads of evidence
appear to lead to a common source of the radioactive decay rate
variation. But there's a huge problem with speculation that solar
neutrinos could impact decay rates on Earth: neutrinos aren't supposed
to work like that.
Neutrinos, born from the nuclear processes in the core of the sun, are
ghostly particles. They can literally pass through the Earth unhindered
as they so weakly interact. How could such a quantum welterweight have
any measurable impact on radioactive samples in the lab?
In short, nobody knows.
If neutrinos are the culprits, it means we are falling terribly short of
understanding the true nature of these subatomic particles. But if (and
this is a big if) neutrinos aren't to blame, is the sun generating an
as-yet-to-be- discovered particle?
If either case is true, we'll have to go back and re-write those
textbooks.
Source: Stanford University:
http://news.stanford.edu/news/2010/august/sun-082310.html
The strange case of solar flares and radioactive elements.
Mystisk kraft fra Solens indre påvirker radioaktive stoffer på Jorden - 30. aug 2010
http://ing.dk/artikel/111387-mystisk-kraft-fra-solens-indre-paavirker-radioaktive-stoffer-paa-jorden
"En tilfældig opdagelse har fået amerikanske forskere til at tabe underkæben.
I Solens indre foregår et eller andet, der påvirker radioaktive stoffer som kulstof-14.
Men det burde bare ikke kunne lade sig gøre.[..]
Jan Rasmussen