specific activity

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spe·cif·ic ac·tiv·i·ty

1. radioactivity per unit mass of the stated element or compound;
2. for an enzyme, the amount of substrate consumed (or product formed) in a given time under given conditions per milligram of protein;
3. activity per unit mass of the stated radionuclide.

specific activity

1 the radioactivity of a radioisotope per unit mass of the element or compound, expressed in microcuries per millimole or disintegrations per second per milligram.
2 the relative radioactivity per unit mass, expressed as counts per minute per milligram. For example, the specific activity of potassium in the human body is the same as that in the environment or diet. Because potassium is associated chiefly with muscle tissue, a whole-body count of 40K, after administration of radioactive potassium, can be used to distinguish lean body mass from total body mass.

spe·cif·ic ac·tiv·i·ty

(spĕ-sif'ik ak-tiv'i-tē)
1. Radioactivity per unit mass of the stated element or compound.
2. For an enzyme, the amount of substrate consumed (or product formed) in a given time under given conditions per milligram of protein.
3. Activity per unit mass of the stated radionuclide.
References in periodicals archive ?
To meet different service level agreements, the Mark-E Aktiengesellschaft needed to compensate for overloads - hereinafter referred to as principal or AG - various support services for specific activities in the field of Customer Care : Framework.
40]K specific activities provided in the analyzed foreign literature vary in the range from 221 to 326 Bq/kg (Khaten et al.
226]Ra specific activities in the silt of Lake Didziulis.
227]Ac specific activities measured in the surface silt and the deeper existing silt.
137]Cs specific activities in the silt of the lakes, presented in the foreign literature, range from 2.
But irrespective of particular value drivers, it's imperative for every organization to clearly identify and prioritize the specific activities that it believes will create significant value.
Furthermore, specific activities and measurement points should be developed within each category.
The interim rule also establishes a mechanism through which financial holding companies or other interested parties may request that the Board find, by order, that particular specific activities fall within one of the three categories.
Specific activities exceeding the limits of protection were repair and servicing and collection activities.
Statements in this news release relating to plans, strategies, economic performance and trends, projections of results of specific activities or investments, and other statements that are not descriptions of historical facts may be forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995, Section 27A of the Securities Act of 1993 and Section 21E of the Securities Exchange Act of 1934.

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