*sigh, I live in Chico, and yes that is a law on the books. It came about in the 60's in protest to nuclear testing, and the city became one of the first "Nuclear-free-zones". They also wanted to keep the local state university out of nuclear research. The actual ordinance is

No person shall produce, test, maintain, or store within the city a nuclear weapon, component of a nuclear weapon, nuclear weapon delivery system, or component of a nuclear weapon delivery system under penalty of Chapter 9.60.030 of the Chico Municipal Code.

I do believe the punishment includes up to 6 months in jail, in addition to the $500 fine

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sorry, *dupeof=http://videosift.com/video/2054-Nuclear-Tests-1945-1998

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From Wiki. Plumbbob was a series of tests; this vid documents one of them. The only hard numbers about actual human disease rates in the Wiki entry needs a citation:

Plumbbob released 58,300 kilocuries (2.16 EBq) of radioiodine (I-131) into the atmosphere. This produced total civilian radiation exposures amounting to 120 million person-rads of thyroid tissue exposure (about 32% of all exposure due to continental nuclear tests).

Statistically speaking, this level of exposure would be expected to eventually cause between 11,000 and 212,000 excess cases of thyroid cancer, leading to between 1,000 and 20,000 deaths.[3]

In addition to civilian exposure, troop exercises conducted near the ground near shot "Smoky" exposed over three thousand servicemen to relatively high levels of radiation. A survey of these servicemen in 1980 found significantly elevated rates of leukemia: ten cases, instead of the baseline expected four.[citation needed]

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http://videosift.com/video/2054-Nuclear-Tests-1945-1998

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Las Vegas, Nev. used the nuclear tests as a tourist attraction. They even had there own superhero, Miss Atomic Bomb.

http://www.reviewjournal.com/lvrj_home/2004/Nov-18-Thu-2004/news/25269450.html

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