Bone-marrow dose equivalent rate, mrem/y
2.0
1.8 fF
1.6 F
—B——O—
—e—
—oO—
Newborn
#£«'-4-month old
93-month old
1.5-y old
—iy—
12-yold
—A—
1.4 +
—e——
4-yold
18-y old
1.2
1.0
0.8
0.6
0.4
0.2 §
0
20
.
40
60
Bone-marrow dose equivalent rate, mrem/y
2.0
1.87
1.27
1.0
0.67
oar
i
i
0.2
(b)
0
—~™—
Newborn
—k—
—ia—
4yold
12-9 old
—Oo—
—8—
—o—
4month old
9-month old
~=—s«*1.y old
—a———«18-y old
10
Years after ingestion
20
30
Figure 4. The annual bone-marrow dose whenintake of 9°Sr beginsat different ages; (a) showslifetime
dose equivalent rates and (b) shows an expanded viewof(a) for the first 30 y of exposure.
9008256
20