conc.
Description
Step
neutrons were
to
come
Lrom
Comments
supposed
ail
forgetfulness)
direc-
tions
Etching
20 minutes etching at
5.94N KOH + 0.495 at
60.5%,
40 minutes etching at
5.72N KOU + Q.305 at
The foils were
totally immersed in
3.5 | KOU after CM reading on the
foils were
less
than
1
mR/hr
60.3°C,
SO minutes etching at
5.14N + 0.428 at 60.3°C
Rinse
15-20 minutes
in circu-
latiny distilled water
Drying
86°C oven till dry
Tracks viewing
ad
tracks from 20 min.
etching are needle Like,
for 40 and 80 min. are
smali and big oval-shaped
length and width of the track
a)
and the track density have not
been measured
holes respectively
b)
tracks that have to be
U or Pu Fission tracks
abound on foils in direct
contact with the Al foil
und on the edges of the
foil.
c)
Tmages of the tooth
and the embedding material
is present
d)
Star agpregates are
present though sparse and
can be Found mainly where
the tooth is but is also
visible where the tooth
isn'é
e)
Needle like tracks
from 40 min and 80 min
etehings seem to be buried in sections where
the dentine of the tooth
was
r)
photomicrozraphs and
polaroid shots of tracks
on the viewing sereen
were
is
taken
2009443
bo}
though the 41 foil has a high
chemical purity,
U contamina-
tion can easiiy come about
through contact with
phere, etc.
c)
the atmos-
due to inadequate contact, images
of the dentine, pulp, enamel are
not distinguishable
d) agpregates could be clusters
of Pu in the teeth or resulting
from background U-238 converSion to Pu-23%