specific activity


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specific activity

[spə′sif·ik ak′tiv·əd·ē]
(nucleonics)
The activity of a radioisotope of an element per unit weight of element present in the sample.
The activity per unit mass of a pure radionuclide.
The activity per unit weight of a sample of radioactive material. In these three cases, specific activity can be expressed in such units as millicuries per gram, disintegrations per second per milligram, or counts per minute per milligram.
References in periodicals archive ?
The specific activity of a radionuclide in a sample (Bq/kg) or volumetric activity in a sample (Bq/m3) is calculated by identifying the radionuclide activity in a sample and sample weight or amount, according to a formula (Dimaviciene, Butkus 2007):
Can you correlate your symptoms with any specific activity, meal, or time of day?
Another of the leads is a tachykinin splice variant that exhibits a specific activity in the peripheral nervous system.
After consultation with the Secretary, the Board will promptly make a written determination regarding whether the specific activity described in the request is included in an activity category listed in paragraph (e)(1) of this section and is therefore either financial in nature or incidental to a financial activity.
In recent experiments, Brown and his colleagues demonstrated that the presence of a transcription complex underlies the specific activity of the oocyte gene.

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