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Tungsten-181   10
Tungsten-185   10
Tungsten-187   100
Uranium (natural)d/   100
Uranium-233   0.01
Uranium-234   0.01
Uranium-235   0.01
Vanadium-48   10
Xenon-131m   1,000
Xenon-133   100
Xenon-135   100
Ytterbium-175   100
Yttrium-90   10
Yttrium-91   10
Yttrium-92   100
Yttrium-93   100
Zinc-65   10
Zinc- 69m   100
Zinc-69   1,000
Zirconium-93   10
Zirconium-95   10
Zirconium-97   10
Any alpha emitting radionuclide not listed above or
mixtures of alpha emitters of unknown composition   0.01
Any radionuclide other than alpha emitting radionuclides,
not listed above or mixtures of beta emitters of unknown
composition   0.1
c/ Based on alpha disintegration rate of Th-232, Th-230 and their daughter products.
d/ Based on alpha disintegration rate of U-238, U-234, and U-235
Note: Where there is involved a combination of isotopes in known amounts, the limit for the combination should be derived as follows: Determine, for each isotope in the combination, the ratio between the quantity present in the combination and the limit otherwise established for the specific isotope when not in combination. The sum of the ratios for all the isotopes in the combination may not exceed “1” — that is, unity.
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Published under s. 35.93, Stats. Updated on the first day of each month. Entire code is always current. The Register date on each page is the date the chapter was last published.