
238 Nuclear Forensic Analysis
TABLE 6.3 (Continued)
4n
C
hronometers
232
Th Chronometer, to be used with ingrown analytes in Th samples
E
lapsed Da
ys
228
Ra/
232
Th
40 5.3673E–12
70 9.3466E–12
100 1.3287E–11
130 1.7188E–11
170 2.2330E–11
220 2.8662E–11
300 3.8580E–11
400 5.0614E–11
550 6.7937E–11
700 8.4422E–11
850 1.0011E–10
1,000 1.1504E–10
1,300 1.4278E–10
1,700 1.7574E–10
2,200 2.1126E–10
3,000 2.5721E–10
4,000 2.9995E–10
5,500 3.4263E–10
7,000 3.6865E–10
8,500 3.8451E–10
10,000 3.9417E–10
13,000 4.0366E–10
17,000 4.0777E–10
22,000 4.0898E–10
30,000 4.0924E–10
40,000 4.0926E–10
55,000 4.0926E–10
70,000 4.0926E–10
228
Ra Chronometer, to be used with ingrown analytes in Ra samples ...