Low Specific Activity
Low Specific Activity (LSA) material means Class 7 (radioactive) material with limited specific activity which satisfies the descriptions and limits set forth below. Shielding materials surrounding the LSA material may not be considered in determining the estimated average specific activity of the package contents. LSA material must be in one of three groups:
  1. LSA-I
    (i) Ores containing only naturally occurring radionuclides (e.g., uranium, thorium) and uranium or thorium concentrates of such ores; or
    (ii) Solid unirradiated natural uranium or depleted uranium or
    natural thorium or their solid or liquid compounds or mixtures; or
    (iii) Class 7 (radioactive) material, other than fissile material, for which the A2 value is unlimited; or
    (iv) Mill tailings, contaminated earth, concrete, rubble, other debris, and activated material in which the Class 7 (radioactive) material is essentially uniformly distributed and the average specific activity does not exceed 10-\6\A2/g.
  2. LSA-II.
    (i) Water with tritium concentration up to 0.8 TBq/liter (20.0 Ci/ liter); or
    (ii) Material in which the Class 7 (radioactive) material is distributed throughout and the average specific activity does not exceed 10-\4\A2/g for solids and gases, and 10-\5\A2/g for liquids.
  3. LSA-III. Solids (e.g., consolidated wastes, activated materials) that meet the requirements of Sec. 173.468 and which:
    (i) The Class 7 (radioactive) material is distributed throughout a solid or a collection of solid objects, or is essentially uniformly distributed in a solid compact binding agent (such as concrete, bitumen, ceramic, etc.); and
    (ii) The Class 7 (radioactive) material is relatively insoluble, or it is intrinsically contained in a relatively insoluble material, so that, even under loss of packaging, the loss of Class 7 (radioactive) material per package by leaching when placed in water for seven days would not exceed 0.1 A2; and
    (iii) The average specific activity of the solid does not exceed 2 x 10-\3\A2/g.

Low toxicity alpha emitters are:
(1) Natural uranium, depleted uranium, and natural thorium;
(2) Ores, concentrates or tailings containing uranium-235, uranium- 238, thorium-232, thorium-228 and thorium-230; or
(3) Alpha emitters with a half-life of less than 10 days.

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