where PF, PG, and PHe are the partial pressures of the fill gas, the evolved gases and decay
The volume occupied by the gas at the evaluation temperature, V1, will be called the "free gas
volume" of the package.
This volume can be
calculated as the
unoccupied volume (Vc)
of the outer can (i.e.,
interior volume of the
Void spaces occupied by gas
outer can less the
volume occupied by the
internal containers), less
the volume occupied by
Figure B-1. Illustration of the components of free gas volume.
the contained material.
These volumes, which are illustrated in Figure B-1, can be represented as
V1 = Vc - Vm
Vc = Vo - vi - vcc
where Vo is the interior volume of the outer container,
vi is the volume of the material of the inner container,
vcc is the volume of the materials making up the convenience container, and
Vm is the volume of the contained material.
Container Fill Gas
The appropriate equation for pressure as a function of temperature is simply the gas law:
PF = P0(V0/V1)(T1/T0).
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