Biomedical Engineering Reference
In-Depth Information
Major Radiations,
Mass Difference
Natural
=
M
-
A
(MeV)
Energies (MeV), and
Abundance
Type of
Frequency per
(at. mass - at.
Nuclide
(%)
mass No.)
Decay
Half-Life
Disintegration (%)
: 0.109 (2%), 0.144 (11%), 0.163 (5%),
0.186 (54%), 0.202 (1%), 0.205
(5%), Th X rays
e
-
: 0.016, 0.020
Daughter radiations from
231
Th, etc.
γ
23
92
U
4.468 × 10
9
y
99.276
47.33
α
α
: 4.149 (23%), 4.198 (77%)
γ
: 0.050 (0.070%), Th X rays
e
-
: 0.030, 0.033, 0.046, 0.050
Daughter radiations from
234
Th,
234m
Pa,
etc.
239
94
Pu
—
48.60
α
24,065 y
α
: 5.105 (11%), 5.143 (15%), 5.156
(74%)
γ
: 0.010 (0.001%), 0.039 (0.006%),
0.052 (0.021%), 0.099 (0.001%),
0.129 (0.006%), 0.375 (0.002%),
0.414 (0.002%), U X rays
e
-
: 0.009, 0.013, 0.018, 0.022, 0.031,
0.034, 0.047
Daughter radiations from
235
U, etc.
*
Source
: Most of the decay data were obtained with the utility code, DEXRAX: K. F. Eckerman, R. J. Westfall, J. C. Ryman, and M. Cristy,
Nuclear Decay Data Files of
the Dosimetry Research Group
, ORNL/TM-12350, Oak Ridge National Laboratory, Oak Ridge, Tenn. (December 1993). See also K. F. Eckerman, R. J. Westfall, J. C.
Ryman, and M. Cristy, “Availability of Nuclear Decay Data in Electronic Form, Including Beta Spectra not Previously Published,”
Health Phys.
67
, 338-345 (1994).
The author is grateful to Dr. Eckerman for his substantial help. Values of the mass differences,
, are from the
Radiological Health Handbook,
U.S. Public Health
