Radiation-based density measurement

In radiation-based density measurement, the medium is irradiated with gamma rays from a radioactive source. The gamma rays are attenuated more or less depending on the density of the medium. The weakened radiation is picked up by a detector, generates impulses there and is converted into a measuring signal. Stored in the detector are impulse rates of media with known density, which serve as calibration data for the density measurement. These data are used to calculate the density from the actual impulse rate. This allows continuous, non-contact measurement of the density of liquids.
 
This measuring technique works independently of process conditions such as pressure and temperature as well as the chemical and physical properties of the product.