Uses of Uranium
Armour piercing weapons
In order for uranium to be used in nuclear weapons and nuclear
reactors it must be enriched in the fissile
isotope U-235. Uranium mined in South Australia contains 0.7% U-235.
In order for uranium to sustain a chain reaction it needs to contain at
least 3% U-235. The process used to increase the U-235 content from
0.7% to 3% and higher is called enrichment.
Enrichment is a very energy intensive process and is responsible
for significant greenhouse gas emissions.
Enrichment leads to two products uranium enriched in U-235
and uranium depleted in U-235. The latter is referred to as depleted
uranium or DU.
There is not a great demand for depleted uranium and hence
it is readily available at low cost. Because uranium is 50% more
dense than lead it has been used for yacht keels, and as ballast in commercial
jet aircraft. The latter is a hazardous use of uranium because if a jet
crashes and catches fire the uranium is converted to finely divided radioactive
dust that is readily ingested and inhaled.
More recently depleted uranium has come into prominence
through its use in armour piercing shells and missiles. Uranium nose cones
were used for this purpose in the Gulf War, in the Balkans conflict and
most recently in Afghanistan. The high combustibility of uranium means
that it can burn its way through armour. At the same time the uranium is
converted to highly divided radioactive oxides.
Because uranium is both a chemical and a radiological
hazard its use in weapons is extremely toxic for both civilians and combatants.
Depleted uranium has been implicated in a condition known as Gulf War syndrome.
The hazard from depleted uranium weapons continues for
generations after its use in weapons.
Greater technical detail can be found on this topic by searching through
the listed briefing papers and education resources at
http://www.ccsa.asn.au/nic/.
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