Rad Data Handbook 20.. - Voss Associates

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