The invention discloses a multifunctional
rare earth product radioactivity detecting instrument based on a composite
detector. The instrument can be used for the radioactivity monitoring of the
rare earth product, and comprises a composite
detector, a
signal conditioning module, a lead chamber, a multi-
channel data collecting and analyzing module, a computer data analyzing and managing module, a power supply managing module with low
power consumption, and the like, wherein the composite
detector is formed by
combing a detector for detecting alpha and beta total amount and a detector for detecting
gamma energy spectrum into a whole. The instrument can be used for simultaneously measuring the alpha and beta total amount and the
gamma energy spectrum, and can give the alpha and beta total amount and the contents of
radium,
uranium,
thorium,
potassium and rate earth self radioactive element through one-time measurement. The instrument can realize the function which is realized by several instruments and several measurements in the prior art through one-time measurement. The invention has broad applying prospect in the radioactivity detecting field of
rare earth industry, and has the advantages of simple and reasonable structure, high price /
performance ratio, low
energy consumption, strong function, convenient use and the like.