215
Y. LEVY et al.
three thin
nin Fig. 2.
shown in
gins SeagieaREE
ysure the
, studied
Nn section
»Sition as
ation be1 specific
a. Figure
mC. In
ilms and
ough the
t
low
cellulose
at’_—=s high
a time
on gwere
‘red by a
of alpha
ts”’, it is
ithin the
tributed.
t spots”
.
ribution
.
.
:
eagpy
thin section c. Note that the high track densities coincide with non-coral material. (c)
1Son ECERE mea
concenthan:in
.
. section
:
Fic. 5. 30 um thin section (transmitted light) (a) Photomicrograph of thin
showing
coral Favites virens texture (1) and Bryozoan-like texture (2). (b) Photomicrograph of
cellulose nitrate detector at same scale as (a) showing the distribution of alpha-emitters in
sections
Photomicrograph of cellulose nitrate superimposed on portion of thin section c [different
magnification than in (a) and (b)j. Left portion is composed of Bryozoan-like texture
which shows manytracks. Upperright portion is coral and lacks -tracks.