California State Route 90
State Route 90 (SR 90) is a state highway in Southern California, United States. It consists of two unconnected pieces in Greater Los Angeles.
The Marina Freeway segment is a short freeway in southwestern Los Angeles and the nearby suburbs, linking Marina del Rey to the rest of Greater Los Angeles. The limited-access portion runs from Slauson Avenue in southern Culver City to just past Culver Boulevard, where it forms the approximate border between the Del Rey and Westchester neighborhoods of the city of Los Angeles. The route continues westward into unincorporated Marina del Rey as an expressway, terminating at Lincoln Boulevard.
The eastern portion of Route 90 is Imperial Highway connecting La Habra, Brea, Yorba Linda and Anaheim Hills. The part in Yorba Linda was relinquished in 2002, and the portion built to freeway standards is now known by two names: The Richard M. Nixon Parkway between Yorba Linda Blvd. and Kellogg Drive, and the Richard M. Nixon Freeway between Kellogg Drive and its southern terminus at Orangethorpe Avenue.
Strontium-90
Strontium-90 (90Sr) is a radioactive isotope of strontium produced by nuclear fission, with a half-life of 28.8 years. It undergoes β− decay into yttrium-90, with a decay energy of 0.546 MeV. Strontium-90 has applications in medicine and industry and is an isotope of concern in fallout from nuclear weapons and nuclear accidents.
Radioactivity
Naturally occurring strontium is nonradioactive and nontoxic at levels normally found in the environment, but 90Sr is a radiation hazard.90Sr undergoes β− decay with a half-life of 28.79 years and a decay energy of 0.546 MeV distributed to an electron, an anti-neutrino, and the yttrium isotope 90Y, which in turn undergoes β− decay with half-life of 64 hours and decay energy 2.28 MeV distributed to an electron, an anti-neutrino, and 90Zr (zirconium), which is stable. Note that 90Sr/Y is almost a pure beta particle source; the gamma photon emission from the decay of 90Y is so infrequent that it can normally be ignored.
90Sr has a specific activity of 5.21 TBq/g.
List of highways numbered 90
The following highways are numbered 90:
Canada
Israel
Highway 90 (Israel)
New Zealand
New Zealand State Highway 90
United States
Interstate 90
U.S. Route 90
Arizona State Route 90
Arkansas Highway 90
California State Route 90
Colorado State Highway 90
Florida State Road 90
Georgia State Route 90
Illinois Route 90
K-90 (Kansas highway)
Kentucky Route 90
Maine State Route 90
Maryland Route 90
M-90 (Michigan highway)
Missouri Route 90
Nevada State Route 90 (former)
New Jersey Route 90
New Mexico State Road 90
New York State Route 90
North Carolina Highway 90
Oregon Route 90 (former)
Pennsylvania Route 90 (1920s-1960s) (former)
South Carolina Highway 90
Tennessee State Route 90
Texas State Highway 90
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Texas State Highway Loop 90 -
Farm to Market Road 90
Texas State Highway Loop 90 Farm to Market Road 90
Utah State Route 90
Virginia State Route 90
West Virginia Route 90
Utah State Route 90
State Route 90 (SR-90) is a state highway in the U.S. state of Utah that sits completely within Brigham City in Box Elder County. The route travels from its western terminus at SR-13 to its eastern terminus at the junction of US-89/US-91.
SR-90 was the old routing of US-89/US-91 through the city before it was re-routed to a path bypassing the town.
Route description
SR-90 begins in the center of Brigham City and heads east through the east-central portion of the town. After continuing east for six blocks, the highway veers to the southeast to meet with US-89/US-91 at the mouth of Brigham Canyon, where SR-90 traffic is diverted to US-89/US-91 northbound through a flyover ramp.
History
200 South in Brigham City was added to the state highway system in 1910, and in the 1920s it became part of SR-1 (US-91). A proposed connection from proposed I-15 southwest of Brigham City east and northeast to SR-1 east of Brigham City was numbered State Route 85 in 1960, and in 1962, when SR-1 was moved to I-15, SR-85 was extended along former SR-1 to Idaho. 200 South, which was bypassed by the construction of SR-85 in about 1971, remained as a spur of SR-85 until 1975, when it was renumbered SR-90.
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