7
(
added to one or the other of the two fractions after separation of the
sample in the laboratory, the total tritium collected will be given by:
where A
s
I
T (atoms) =A
(Eds
x Cr
- Cre)
total atoms of hydrogen (all isotopes) added as
tracer (spike).
Cd, = concentration of deuterium in the tracer (atoms
per atom of hydrogen, all isotopes).
Cd, = atom concentration of deuterium in the recovered
sample.
Cre = atom concentration of tritium in the recovered
sample.
Ce. = concentration of tritium in the tracer.
3.2
Amount of Air Sampled
The volume of air collected is estimated by measuring the total
number of revolutions of the blower calibrated under simulated conditions
and by photographing the inflated collection bag to estimate its dimensions.
The mass of air sampled requires a knowledge of the precise altitude
of the collection in order to assign the density.
3.3
T/HValues
It is obvious that the concentration of tritium per gram of air
ray be ascertained even though water is added or subtracted indiscrininately prior to the laboratory separation into the two fractions;
this
of course, provided any added water contains no appreciable tritium or
deuterium (any tropospheric water would produce no eppreciable error).
On the other hand, only subtraction of water from the original
collection is permissible if T/H ratios ere desired,
With the enormous
areas Of polyethylene involved and the possibilities of exchange of the
Soup
sens