Panasonic PT-DZ12000U Operating Instructions Manual page 35

Uranium-238 Decay (including Radon progeny)
st
1 Progeny
238 234
U Th
4.47E9y
234 234m
Th Pa
24.1d
234m
Pa decays 99.87 % of the time by â to U
time by IT to Pa
234m 234
Pa U
1.17m
234
Pa
234 234
Pa U
6.70h
234 230
U Th
2.45E5y
230 226
Th Ra
7.7E4y
226 222
Ra Rn
1600y
kev and % abundance
á 4039 (0.2), 4147 (23.4), 4196 (77.4)
ã av. 66 (0.1)
Th x-rays 13 (8.8)
-
â
ã 63 (3.8), 92 (2.7), 93 (2.7)
Pa x-rays 13 (9.6)
234
-
â 1236 (0.7), 1471 (0.6), 2281 (98.6)
ã 766 (0.2), 926 (0.4), 1001 (0.6)
U x-rays 14 (0.44), 95 (0.115), 98 (0.187)
IT
-
â 484 (35), 654 (16), 1183 (10)
ã 131 (20.4), 882 (24), 946 (12)
U x-rays 14 (114), 95 (15.7), 98 (25.4), 111(11.8)
á 4605 (0.2), 4724 (27.4), 4776 (72.4)
ã 53 (0.118), 121 (0.04)
Th x-rays 13 (10.5)
á 4476 (0.12), 4621 (23.4), 4688 (76.3)
ã 68 (0.4), 168 (0.07)
Ra x-rays 12 (8.4)
á 4602 (5.6), 4785 (94.4)
ã 186 (3.28)
Rn x-rays 12 (0.8), 81 (0.18), 84 (0.3), 95 (0.14)
76 (2), 96 (25.3), 189 (72.5)
-
24
234
& 0.13 % of the