Gilson and Voss - Voss Associates
Gilson and Voss - Voss Associates
Gilson and Voss - Voss Associates
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APPROXIMATE NEUTRON ENERGIES<br />
cold neutrons 0 - 0.025 eV<br />
thermal<br />
0.025 eV<br />
epithermal 0.025 - 0.4 eV<br />
cadmium<br />
0.4 - 0.6 eV<br />
epicadmium 0.6 - 1 eV<br />
slow<br />
1 eV - 10 eV<br />
resonance 10 eV - 300 eV<br />
intermediate 300 eV - 1 MeV<br />
fast<br />
1 MeV - 20 MeV<br />
relativistic<br />
> 20 MeV<br />
Note: A thermal neutron is one which has the same energy <strong>and</strong><br />
moves at the same velocity as a gas molecule does at a<br />
temperature of 20 degrees C. The velocity of a thermal neutron<br />
is 2200 m / sec (~5,000 mph).<br />
Neutron Fluence per mrem (10CFR20)<br />
2<br />
n/cm<br />
2<br />
n/cm /s<br />
2<br />
n/cm<br />
2<br />
n/cm /s<br />
per per per per<br />
MeV mrem mrem/hr MeV mrem mrem/hr<br />
thermal ....... ...... 10 2.4E4 6.7<br />
to 9E5 250 14 1.7E4 4.7<br />
1E-2 ........ ....... 20 1.6E4 4.4<br />
1E-1 1.7E5 47 40 1.4E4 6.7<br />
5E-1 3.9E4 11 60 1.6E4 4.4<br />
1 2.7E4 7.5 100 2E4 5.6<br />
2.5 2.9E4 8 200 1.9E4 5.3<br />
5 2.3E4 6.4 300 1.6E4 4.4<br />
7 2.4E4 6.7 400 1.4E4 6.7<br />
APPROXIMATE NEUTRON ENERGIES<br />
cold neutrons 0 - 0.025 eV<br />
thermal<br />
0.025 eV<br />
epithermal 0.025 - 0.4 eV<br />
cadmium<br />
0.4 - 0.6 eV<br />
epicadmium 0.6 - 1 eV<br />
slow<br />
1 eV - 10 eV<br />
resonance 10 eV - 300 eV<br />
intermediate 300 eV - 1 MeV<br />
fast<br />
1 MeV - 20 MeV<br />
relativistic<br />
> 20 MeV<br />
Note: A thermal neutron is one which has the same energy <strong>and</strong><br />
moves at the same velocity as a gas molecule does at a<br />
temperature of 20 degrees C. The velocity of a thermal neutron<br />
is 2200 m / sec (~5,000 mph).<br />
Neutron Fluence per mrem (10CFR20)<br />
2<br />
n/cm<br />
2<br />
n/cm /s<br />
2<br />
n/cm<br />
2<br />
n/cm /s<br />
per per per per<br />
MeV mrem mrem/hr MeV mrem mrem/hr<br />
thermal ....... ...... 10 2.4E4 6.7<br />
to 9E5 250 14 1.7E4 4.7<br />
1E-2 ........ ....... 20 1.6E4 4.4<br />
1E-1 1.7E5 47 40 1.4E4 6.7<br />
5E-1 3.9E4 11 60 1.6E4 4.4<br />
1 2.7E4 7.5 100 2E4 5.6<br />
2.5 2.9E4 8 200 1.9E4 5.3<br />
5 2.3E4 6.4 300 1.6E4 4.4<br />
7 2.4E4 6.7 400 1.4E4 6.7<br />
Page 130<br />
Page 130<br />
APPROXIMATE NEUTRON ENERGIES<br />
cold neutrons 0 - 0.025 eV<br />
thermal<br />
0.025 eV<br />
epithermal 0.025 - 0.4 eV<br />
cadmium<br />
0.4 - 0.6 eV<br />
epicadmium 0.6 - 1 eV<br />
slow<br />
1 eV - 10 eV<br />
resonance 10 eV - 300 eV<br />
intermediate 300 eV - 1 MeV<br />
fast<br />
1 MeV - 20 MeV<br />
relativistic<br />
> 20 MeV<br />
Note: A thermal neutron is one which has the same energy <strong>and</strong><br />
moves at the same velocity as a gas molecule does at a<br />
temperature of 20 degrees C. The velocity of a thermal neutron<br />
is 2200 m / sec (~5,000 mph).<br />
Neutron Fluence per mrem (10CFR20)<br />
2<br />
n/cm<br />
2<br />
n/cm /s<br />
2<br />
n/cm<br />
2<br />
n/cm /s<br />
per per per per<br />
MeV mrem mrem/hr MeV mrem mrem/hr<br />
thermal ....... ...... 10 2.4E4 6.7<br />
to 9E5 250 14 1.7E4 4.7<br />
1E-2 ........ ....... 20 1.6E4 4.4<br />
1E-1 1.7E5 47 40 1.4E4 6.7<br />
5E-1 3.9E4 11 60 1.6E4 4.4<br />
1 2.7E4 7.5 100 2E4 5.6<br />
2.5 2.9E4 8 200 1.9E4 5.3<br />
5 2.3E4 6.4 300 1.6E4 4.4<br />
7 2.4E4 6.7 400 1.4E4 6.7<br />
APPROXIMATE NEUTRON ENERGIES<br />
cold neutrons 0 - 0.025 eV<br />
thermal<br />
0.025 eV<br />
epithermal 0.025 - 0.4 eV<br />
cadmium<br />
0.4 - 0.6 eV<br />
epicadmium 0.6 - 1 eV<br />
slow<br />
1 eV - 10 eV<br />
resonance 10 eV - 300 eV<br />
intermediate 300 eV - 1 MeV<br />
fast<br />
1 MeV - 20 MeV<br />
relativistic<br />
> 20 MeV<br />
Note: A thermal neutron is one which has the same energy <strong>and</strong><br />
moves at the same velocity as a gas molecule does at a<br />
temperature of 20 degrees C. The velocity of a thermal neutron<br />
is 2200 m / sec (~5,000 mph).<br />
Neutron Fluence per mrem (10CFR20)<br />
2<br />
n/cm<br />
2<br />
n/cm /s<br />
2<br />
n/cm<br />
2<br />
n/cm /s<br />
per per per per<br />
MeV mrem mrem/hr MeV mrem mrem/hr<br />
thermal ....... ...... 10 2.4E4 6.7<br />
to 9E5 250 14 1.7E4 4.7<br />
1E-2 ........ ....... 20 1.6E4 4.4<br />
1E-1 1.7E5 47 40 1.4E4 6.7<br />
5E-1 3.9E4 11 60 1.6E4 4.4<br />
1 2.7E4 7.5 100 2E4 5.6<br />
2.5 2.9E4 8 200 1.9E4 5.3<br />
5 2.3E4 6.4 300 1.6E4 4.4<br />
7 2.4E4 6.7 400 1.4E4 6.7<br />
Page 130<br />
Page 130
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