into the drying oven and is taken out and put into trays.
We keep trays
marked “clean” and "dirty" so we don't get into the wrong one when we do
The sieves are cleaned with wire brushes and compressed
another operation.
air.
If you will
go back to the viewgraph flow chart (HH-2),
I'll go
through it as my summary.
We obtain the wet weight of the specimen that has come in from the
field.
We cut up the vegetation.
We remove the rock and the large roots.
We transfer the remaining material to drying cans.
The specimens are dried
10
24 hours at 1050C.
11
shown pictures of weighing on the scales.
12
operations.
13
mill for three hours, separate the less than five hundred micron material
14
on the screen.
“15 hour.
They come out of the ovens, are weighed.
I have not
There are a number of those
Put the specimen onto the ball
We add the grinding balls.
Send the coarse material back into ball-milling for another
Sieve again.
Ball mill for an hour.
Make our final sieving.
All
16 of the fine materials have been added together from those three grindings.
17
The fine material is composited,
The coarse material goes off to storage.
18 mixed, and we will start weighing out the specimens for radiochemistry.
In
19
the procedure, if we have the material, we will weigh out two specimens for
20
cesium-137.
One
goes
to radiochemistry,
and
one we
keep
in
storage.
21 Sooner or later there are going to be those calls for duplicates and we
22
prefer not to have to go searching for the duplicate in storage.
23
We make up, and I show a dotted line because it's not a procedure that
24 we perform at the time that we do the weighing out for the cesium, and make
25
up a 200-gram composite sample from two specimens which represent incre-
26
ments one and two or increments three and four from the initial profile.
27
The
28
material, we make up two of the plutonium composites.
remaining
fine
material
goes
to
146
storage.
Again,
if we
have
the