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Quality Factor Chart
JenCrabtree:
Thanks everyone!! You all have been very helpful.
Hope everyone has a great weekend!!!!
Rennhack:
--- Quote from: Marlin on May 14, 2020, 11:07 ---Hmmm... don't have a citation for this but as I remember it from a Health Physics magazine a few decades ago energies over 15 Mev were relativistic and exposure had more to do with secondary interactions.
--- End quote ---
You mean 13 TeV, not 15 Mev.
eV > KeV > MeV > GeV > TeV > PeV > EeV
A relativistic neutron is a neutron which moves with a relativistic speed; that is, a speed comparable to the speed of light.
Neutrons are relativistic when their kinetic energy is comparable to or greater than the energy corresponding to their rest mass. In other words, a neutron is relativistic when its total mass-energy (rest mass + kinetic energy) is at least twice its rest mass. This condition implies that the neutron's speed is close to the speed of light. This requires the particle to move at 86% or more of the speed of light.
Such relativistic neutron are generated in the Relativistic Heavy Ion Collider (RHIC) & Large Hadron Collider (LHC), as well as naturally occurring in cosmic radiation.
For example, at the Large Hadron Collider operating with a collision energy of 13 TeV, a relativistic neutron has a mass-energy 6,927 times greater than its rest mass and travels at 99.999998958% of the speed of light.
At the RHIC, The projectiles typically travel at a speed of 99.995% of the speed of light. For Au + Au collisions, the center-of-mass energy is typically 200 GeV per nucleon-pair, and was as low as 7.7 GeV per nucleon-pair. (Because its so heavy, it can go slower). Run-9 achieved center-of-mass energy of 500 GeV on 12 February 2009.
Cosmic Rays range from GeV to EeV
GLW:
--- Quote from: Rennhack on May 15, 2020, 10:07 ---You mean 13 TeV, not 15 Mev.
eV > KeV > MeV > GeV > TeV > PeV > EeV
A relativistic neutron is a neutron which moves with a relativistic speed; that is, a speed comparable to the speed of light.
Neutrons are relativistic when their kinetic energy is comparable to or greater than the energy corresponding to their rest mass. In other words, a neutron is relativistic when its total mass-energy (rest mass + kinetic energy) is at least twice its rest mass. This condition implies that the neutron's speed is close to the speed of light. This requires the particle to move at 86% or more of the speed of light.
Such relativistic neutron are generated in the Relativistic Heavy Ion Collider (RHIC) & Large Hadron Collider (LHC), as well as naturally occurring in cosmic radiation.
For example, at the Large Hadron Collider operating with a collision energy of 13 TeV, a relativistic neutron has a mass-energy 6,927 times greater than its rest mass and travels at 99.999998958% of the speed of light.
At the RHIC, The projectiles typically travel at a speed of 99.995% of the speed of light. For Au + Au collisions, the center-of-mass energy is typically 200 GeV per nucleon-pair, and was as low as 7.7 GeV per nucleon-pair. (Because its so heavy, it can go slower). Run-9 achieved center-of-mass energy of 500 GeV on 12 February 2009.
Cosmic Rays range from GeV to EeV
--- End quote ---
this is why scientists are the worst people for making a definitive decision -> there's never enough data,....
meanwhile world's collide, cats sleep with dogs, women and children die and whole societies collapse,...
scotoma:
Has anybody noticed that personal neutron dosimetry seems to measure neutron dose lower than neutron radiacs.
GLW:
--- Quote from: scotoma on May 24, 2020, 08:08 ---Has anybody noticed that personal neutron dosimetry seems to measure neutron dose lower than neutron radiacs.
--- End quote ---
yep, that's pert much on purpose and the nature of the beast,....
neutron "dose" is highly dependent on energy, handheld meters are calibrated to allow over compenstation,....
dosimetry does not (over compensate),....
it's only common sense ( and that ALARA crap) to use work controls which produce a lower legal dose record,...
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