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Fig. 46—Diminution of Ca in rabbit vertebrae
At long times, however, the high level Ra dogs con-
tinued to show the samedifference, while the Ca rabbits showed a much higher loss of diffuse label from
the vertebra than from the tibia, in parallel with the
loss in activity from the individual bone, not from the
skeleton as a whole.
In the human radium cases, the quantitative auto-
radiographie data on bones other than the cortex of the
long bones, is insufficient to draw any conclusions re-
garding any difference in either the diffuse or ho
activity between different bones or the pattern 01
with time. A study along these lines is in progre
our laboratory. However,since the concentration 11
cortex of the tibia bears a much more constant rat
the average skeletal concentrations than any «
bone studied (Figure 42), the use of the diffuse
in this site as an index for total skeletal retention. 1
appear to be a good choice.