How to detect the specific activity of radionuclides? With what instrument? Thank you.

Specific activity, also known as specific radioactivity, refers to the ratio of radioactivity of radioactive source to its mass, that is, the radioactivity of a certain nuclide contained in a product with unit mass (usually expressed by weight). Its symbol is C, and the unit is BQ/g. In radioactive solution, the specific activity is usually expressed by the activity in unit volume solution, and the unit is Bekkerel per milliliter (Bq/ml).

The instruments and methods required for radioactivity determination depend on the types of nuclides and rays.

For example: 3H, 14C, 32P, etc. Can be measured by liquid scintillation counter (liquid scintillation);

125I, 60Co, etc. γ counter (or radioimmunoassay) can be used for rapid determination;

For nuclides that emit gamma rays, it is certainly better to measure them with a gamma spectrometer.

In order to prevent pollution, there are surface pollution detectors.

In a word, there are many instruments involved in radioactive detection, and appropriate detection instruments and methods should be determined according to specific conditions.