
228 Nuclear Forensic Analysis
TABLE 6.1 (Continued)
4n
+ 2 C
hronometers
226
Ra Chronometer, to be used with ingrown analytes in Ra samples
E
lapsed Da
ys
210
Pb/
226
Ra
1,700 1.8749E–03
2,200 2.3790E–03
3,000 3.1429E–03
4,000 4.0283E–03
5,500 5.2247E–03
7,000 6.2794E–03
8,500 7.2096E–03
10,000 8.0296E–03
13,000 9.3903E–03
17,000 1.0746E–02
22,000 1.1910E–02
30,000 1.3002E–02
40,000 1.3650E–02
55,000 1.4003E–02
70,000 1.4103E–02
238
U Chronometer (short), to be used with ingrown analytes in
U
samples; useful onl
y
for short elapsed times
E
lapsed Da
ys
234
Th/
238
U
0 0.0000E+00
0.08333 3.5353E–14
0.166667 7.0621E–14
0.291667 1.2337E–13
0.5 2.1085E–13
0.75 3.1515E–13
1 4.1869E–13 ...