Abstract: A kind of non-contact high precision nuclear densimeter was developed. Based on the basic principle of interaction betweenγ-ray and substances, the parameters such as density and concentration of the medium in the pipe or vessel were determined by measuring the change of ray intensity. An anticoincidence circuit and high count rate chip were used to reduce the effect of the rise-fall of the ray intensity statistics on the measurement accuracy, leading to a satisfactory measuring accuracy, response speed and stability.

Key words: γ-ray, Nuclear densimeter, Measurement of ore pulp density