5.
Protective measures necessary for toxic materials
a.
Operations in closed systems
b,
Good ventilation
c.
Protective clothing
d.
Good personal hygiene practices
Pyrophoricity
1.
Pyrophoric materials capable of igniting spontaneously
2.
Uranium, plutonium, thorium, zirconium, sodium, and potassium
are used in atomic energy industry
3.
Spontaneous ignition of massive metal is very rare
4.
Most severe pyrophoric problems arise when metal is in powder
form
a.
Powders have much greater surface area on which to generate
heat
b.
Powders have much smaller mass of metal in which to dissi
pate this heat
c.
Powders have much smaller percentage of total surface area
available for loss of heat to external surroundings
5.
Moisture increases pyrophoricity
a.
Some metals react violently with water
b.
Uranium high termperature reaction with steam is much more
violent than with oxygen
ce.
Only common factor involved in all pyrophoricity accidents
investigated is hydrogen
DO’ ARCHIVES