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Physics 6
Spring 2005
Some concepts covered since second exam
fission
neutrons
isotopes  235 and 238 Uranium  separation  thermal separation
chain reaction
 neutrons per fission ~= 2.3
scattering  elastic, inelastic
capture
cross section
energy

200 MeV per breakup of U
critical
radius (or mass) and mean free path
Other terms:
isotopes, curve of binding energy, mass defect
massenergy, kinetic energy
energy units:
Joule (MKS system), eV, MeV, kiloton (kT)
1 .6
×
10
19
J = 1 eV, 1 MeV = 10
6
eV, 1 kT= 4.2
×
10
12
J
radiation, radioactivity, radionuclide, alpha, beta, gamma
halflife, exponential decay
activity = (0.69/T
1/2
) N
(N=number of decaying nuclei)
activity is in units of disintegrations per second or Becquerel (Bq)
Radiation units
: Curies (1 Ci = 3.7
×
10
10
decays/sec, 1 decay/sec=1 Bq), Roentgens, rads, rems
(see Lecture 21)
If needed on the Final the radiation order of magnitude “Rules of Thumb” will be given:
a. 1 gram of Ra or a 1 Ci source produces 1 R per hour at 1 meter distance;
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 Spring '06
 GaryR.Goldstein
 Physics, Neutron

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