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PLATE 11306

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Fig. 4.

1

200

\

300

DAYS

AFTER

!

400

MAY

I

14,

500

1954

|

600

700

Decay of beta-activity in three Coenobita carapace samples, each compared with the
theoretical decay curve ( solid lines ) for sr89 + Sr99 from Figures 2 and 3.

_

-2eTt-

@

104

Select target paragraph3