Ne a P
Bone-marrow dose equivalent rate, mrem/y
2.0
18 |
1.67
Newborn
4-month old
9-month old
1.5-y oid
1.4f
18-y old
4-y oid
12-y old
1.2 |
1.0
0.8
0.6
0.4
0.2 |
40
60
Bone-marrow dose equivalent rate, mrem/y
2.0
1.85
1.07
0.87
Newborn
4-month old
9-month old
1.5-y old
4-y old
12-y oid
18-y old
0.4
0.2
10
Years after ingestion
30
Figure 4. The annual bone-marrow dose when intake of ?9Sr begins at different ages; (a) shows lifetime
dose equivalentrates and (b) shows an expanded view of(a) for the first 30 y of exposure.
JO00T Ty
20