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Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
Ash Small wrote ...
Neutrons don't just travel in one direction, they travel in all directions.
The neutrons appear to have been free to travel in only a narrow path, thus some directionality was involved. If you believe the publically available info.
Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
Patrick wrote ...
.The neutrons appear to have been free to travel in only a narrow path, thus some directionality was involved. If you believe the publically available info.
That is completely ridiculous.
Electrons and protons, (even alphas) can be 'made' to travel in a beam, using electrostatics/magnetics.
Neutrons connot, under any circumstances, be made to travel in a 'beam'.
I can't even envisage how you could surround a neutron source with a 'moderator' such as water in such a way that only a fraction going in one certain direction could 'escape'.
Sounds like they've only 'detected' them at one point, and therefore wrongly 'deduced' that there 'is no evidence that it is not a beam'.
NEUTRONS CANNOT BE MADE TO TRAVEL IN BEAMS, they have a neutral charge.
EDIT: Neutrons are also notoriously difficult to detect. I understand that scintillators, etc only detect neutrons within certain 'energy ranges', and that any given detector will not detect neutrons above or below a certain 'band' of energies. (maybe someone can 'clarify' this point?)
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
So the NRC Neutron Beam Centre is just a front for something more sinister?
You make a neutron beam by collimating them with a big lump of shielding that has a hole in it.
I think the reasoning behind the Tepco report goes as follows:
You need a fission reaction to make neutrons. You need a critical mass of fissile material to make a fission reaction. The nearest one of those is in the reactor 1.5km from the neutron monitor.
It is too horrible to think that neutrons are raking the countryside in all directions, therefore they must be in a beam that happens to be directed towards the monitoring station.
Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
Steve McConner wrote ...
So the NRC Neutron Beam Centre is just a front for something more sinister?
You make a neutron beam by collimating them with a big lump of shielding that has a hole in it.
I think the reasoning behind the Tepco report goes as follows:
You need a fission reaction to make neutrons. You need a critical mass of fissile material to make a fission reaction. The nearest one of those is in the reactor 1.5km from the neutron monitor.
It is too horrible to think that neutrons are raking the countryside in all directions, therefore they must be in a beam that happens to be directed towards the monitoring station.
I agree with your points Steve. (although there are other ways to produce neutrons eg fusion, spallation)
EDIT: I came across this comment on another forum:
"I suspect that "beam" is a mistranslation from the original Japanese."
Registered Member #2099
Joined: Wed Apr 29 2009, 12:22AM
Location: Los Altos, California
Posts: 1716
If anyone wants to play with the numbers, 1) here are some coefficients for translating sieverts to neutrons.
See document NRC CFR 20.1004, available for free at "1 rem (0.01 Sv) of neutron radiation of unknown energies may, for purposes of the regulations in this part, be assumed to result from a total fluence of 25 million neutrons per square centimeter incident upon the body. " "If sufficient information exists to estimate the approximate energy distribution of the neutrons ... Table 1004(b).2.--Mean Quality Factors, Q, and Fluence Per Unit Dose Equivalent for Monoenergetic Neutrons ... Neutron energy (MeV); Quality factor (Q); Fluence per unit dose equivalent (neutrons cm-2 rem -1)
2.5e-8(thermal) 2 980million
...
2.5 9 29million
2)Scale of another criticality accident. The accident at Tokaimura fuel processing plant on Sept. 30, 1999 is estimated to have caused a total of 2e18 to 3e18 fissions. Two workers in the same room received ultimately fatal doses of 17 and 10 Sv; a third worker received 3 Sv and has recovered.
Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
Proud Mary wrote ...
Fukushima radioactivity hits 7.5m times legal limit
It seems that even 7,5 million times the legal limit is just a drop in the ocean, and nothing to get exercised about.
And yes big corporate media is a problem, but an equal problem is the dishonest main stream media controlled by big government liberals, here in the US. Honest, independent journalism is dead, throw some dirt on it.
from the article Proud Mary links to:
"Restoring public trust is also likely to take months.
Unease about reliability and transparency were fuelled by reports that the Meteorological Agency has withheld forecasts on the dispersal of radioactive substances. Although the government body provided information on wind patterns and discharges to the International Atomic Energy Agency, the Japanese public was kept in the dark. "
I would laugh in the face of these cowards, if I this whole thing wasnt so sad.
"Restoring public trust is also likely to take months." I mean are they serious?
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Nuclear events taking place in Japan.
