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Page Title:
Physical Properties |
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|  DOE-HDBK-1105-2002
Radiological Training for Tritium Facilities
Instructor's Guide
Notes
D. Physical Properties
1.
Diffusion
Tritium gas is lighter than air and
Show OT 16
diffuses rapidly in air.
Show OT 17
2.
Permeability
Show OT 18
Tritium gas permeates through most
materials, that is, it travels through them
by way of spaces or interstices in them.
The rate depends upon the material and
its thickness. Tritium's radioactive,
chemically reducing and diffusive
properties result in degradation of many
useful polymeric materials, pump oils,
plastics, and o-rings. This can cause loss
of mechanical functions in certain
situations within a short period of time.
H decays to 3 He + β -- + υ
3
1
2
E.
Radioactive Decay of Tritium
3
He = Helium
2
υ = anti - neutrino
β - = beta minus
Show OT 19
Tritium "decays" by emitting a beta particle
and becoming an atom of helium.
11
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