Uranium

  • Uranium metal, pyrophoric
Formula
U
Structure
Description
A silver-gray radioactive metal. Radioactive materials emit ionizing radiation that can only be detected using special instruments. Film is also damaged by radiation.
Uses
Source of fissionable isotope (235)uranium, source of plutonium by neutron capture, electric power generation.

Registry Numbers and Inventories.
CAS
7440-61-1
EC (EINECS/ELINCS)
231-170-6
EC Index Number
092-001-00-8
EC Class
Very toxic; Danger of cumulative effects; Dangerous for the Environment
RTECS
YR3490000
RTECS class
Other
UN (DOT)
2979
Merck
12,9990
Beilstein/Gmelin
16315 (G)
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Korea ECL
Listed

Properties.
Formula
F6O2U(4-)
Formula mass
238.03
Melting point, °C
1147.2
Boiling point, °C
3818
Density
19.05 g/cm3 (20 C)
Solubility in water
Insoluble
Heat of fusion
12.1 kJ/mol
Heat of vaporization
446.7 kj/mol

Hazards and Protection.
Storage
Keep in a cool, dry, dark location in a tightly sealed container or cylinder. Keep away from incompatible materials, ignition sources and untrained individuals. Secure and label area. Protect containers/cylinders from physical damage.
Handling
All chemicals should be considered hazardous. Avoid direct physical contact. Use appropriate, approved safety equipment. Untrained individuals should not handle this chemical or its container. Handling should occur in a chemical fume hood.
Protection
Wear appropriate protective gloves, clothing and goggles.
Respirators
Wear positive pressure self-contained breathing apparatus (SCBA).
Small spills/leaks
Contact the local, state, or Department Of Energy Radiological Response Team. Do not use water. Keep sparks, flames, and other sources of ignition away. Keep material out of water sources and sewers. Keep material dry. Do not attempt to sweep up dry material. Cover all suspected material with dry sand or earth to prevent ignition until material can be permanently disposed of.
Stability
In air the metal becomes coated with a layer of oxide.
Incompatibilities
Reacts with incandescence with hot selenium or with boiling sulfur.
Decomposition
It is attacked by water, acids and peroxides. When finely powdered, slowly decomposes in cold water, more quickly in boiling water.

Fire.
Fire fighting
Contact the local, state, or Department Of Energy Radiological Response Team. Do not use water. Use graphite, soda ash, powdered sodium chloride, or suitable dry powder. When fire is out, cover all suspected material with dry sand or earth to prevent re-ignition until material can be permanently disposed of.
Fire potential
May burn but does not ignite readily.
Hazards
Some of these materials may burn, but most do not ignite readily. Uranium and Thorium metal cuttings may ignite spontaneously if exposed to air. Extremely flammable; will ignite itself if exposed to air. Burns rapidly, releasing dense, white, irritating fumes. Substance may be transported in a molten form. May re-ignite after fire is extinguished. Nitrates are oxidizers and may ignite other combustibles. May explode from heat or contamination. Some may burn rapidly. Some will react explosively with hydrocarbons (fuels). May ignite combustibles (wood, paper, oil, clothing, etc.). Containers may explode when heated. Runoff may create fire or explosion hazard.

Health.
Exposure limit(s)
NIOSH REL: Ca TWA 0.2 mg/m3 ST 0.6 mg/m3 See Appendix A OSHA PEL: TWA 0.25 mg/m3 IDLH Ca [10 mg/m3 (as U)]
Carcinogin
G-A1
Exposure effects
Supralethal radiation doses may result in headache, acute brain syndrome, alterations in mental status including coma, and (rarely) seizures within minutes of exposure. Prenatal ionizing radiation exposure may cause congenital anomalies, mental retardation, and an increased incidence of seizures.
   Ingestion
Gastrointestinal syndrome (nausea/vomiting) commonly occurs after doses of 9 to 20 gy and may occur following doses as low as 5 gy. Initial vomiting is followed by persistent diarrhea, which may be bloody.
   Inhalation
Pulmonary radiation injury may result in radiation pneumonitis and radiation pulmonary fibrosis.
   Skin
Thermonuclear burns may occur. If erythema is produced by a penetrating radiation, serious systemic injury is certain.
   Eyes
See Inhalation.

First aid
 
   Ingestion
Medical problems take priority over radiological concerns. Use first aid treatment according to the nature of the injury. Do not delay care and transport of a seriously injured person.
   Inhalation
Monitoring exposed patients for contamination and decontamination procedures should be started. All personnel involved in handling patients should wear disposable protective clothing. The patient should be completely undressed and given a soap and water bath or shower (if the patient's condition permits and if the facility exists). Acute inhalation of radionuclides presents some difficult problems.
   Skin
Immediately flush with running water for at least 20 minutes. See Ingestion.
   Eyes
Immediately flush with running water for at least 20 minutes. See Ingestion.

Transport.
UN number
2979
Response guide
Hazard class
7
Std. Transport #
4929111