My friend, see http://www.nndc.bnl.gov/chart/chartNuc.jsp. in this site is possible to see many information for decai scheme. for uranium don't appear proton . I don't now any natural radionuclide when decay used proton.
Dataset #1:
Authors: F. E. CHUKREEV, V. E. MAKARENKO, M. J. MARTIN Citation:Nuclear Data Sheets 97,129 (2002)
Parent
Nucleus Parent
E(level) Parent
Jπ Parent
T1/2 Decay Mode GS-GS Q-value
(keV) Daughter
Nucleus Decay
Scheme ENSDF
file
238
92 U
2557.95 0+ 280 ns 6 IT: 97.4 4 %
238
92 U
Electrons:
Energy
(keV) Intensity
(%) Dose
( MeV/Bq-s )
Auger L 9.89 0.088 % 3 8.7E-6 3
Auger K 72.6 0.0067 % 9 4.8E-6 6
CE K 2442.4 20 0.22 % 0.0054
Gamma and X-ray radiation:
Energy
(keV) Intensity
(%) Dose
( MeV/Bq-s )
XR l 13.6 0.088 % 3 1.20E-5 5
XR kα2 94.654 0.0626 % 13 5.92E-5 13
XR kα1 98.434 0.1001 % 20 9.85E-5 20
XR kβ3 110.421 0.01254 % 24 1.38E-5 3
XR kβ1 111.298 0.0237 % 5 2.64E-5 5
XR kβ2 114.445 0.00921 % 18 1.054E-5 20
1879 32 % 8 0.60 16
2512.7 5 65 % 12 1.6 3
Gamma Coincidence Data:
For each gamma, the list of gammas in coincidence is given. If experimentally known, an estimate of the average time interval (in seconds) between both gammas is given
U-238 decay modes are alpha and, quite rarely, spontaneous fission (5e-5 %). The single beta-decay is forbidden because U-238 is a gg-nuclide. Double beta decay occurs with a probability of 2e-10%, so this is rather exotic.
U-238 decays decay chain is like this U-238---------alpha emission------->Th-234-----beta-emission----->Protactinium-234------Beta emission------>Uranium-234-----alpha emission--->Thorium-230----alpha----->Radium-226------alpha----->Radon-222-----alpha---->Polonium-218-------alpha----->Lead-214------beta----->Bismuth-214-----beta----->Polonium-214-----alpha---->Lead-210--------beta------>Bismuth-210-------beta----->Polonium-210------ Lead-206 (this is the stable nuclei)