4731.7170 TRITIUM NEUTRON GENERATOR TARGET SOURCE.
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A.
Use of a tritium neutron generator target source, containing quantities not exceeding 30 curies (1,110 MBq) and in a well with a surface casing to protect freshwater aquifers, is subject to parts 4731.7000 to 4731.7270, except parts 4731.7030 and 4731.7100.
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B.
Use of a tritium neutron generator target source, containing quantities exceeding 30 curies (1,110 MBq) or in a well without a surface casing to protect freshwater aquifers, is subject to parts 4731.7000 to 4731.7280, except part 4731.7100.