Transient radon emanation capability for loose fragmented radon-emitting medium

The uranium ore heap in the stope of underground in-place leaching of fragmented uranium ore by blasting is a loose fragmented radon-emitting medium. Its particle size distribution subordinated to Rosin-Rammler distribution law. The medium is one of the main radon sources in the underground uranium mine, using in-place leaching of fragmented uranium ore by blasting. The transient radon emanation capability of this medium is a very important parameter for determining the amount of fresh air for ventilation and radon discharging in the stope of in-place leaching of a uranium mine and for simulating the radon emanation and transport in loose fragmented radon-emitting medium and is affected by transient radon concentration, characteristic particle size, particle size distribution index and moisture content of the medium. In order to study such influences, a self designed apparatus is used to make tests on seven samples which are compounded by using Rosin-Rammler distribution law and bared on the test results, the adaptive neuro-fuzzy inference system (ANFIS) is used to establish the ANFIS models for predicting transient radon emanation capability. The research results show that the transient radon emanation capability of loose fragmented radon-emitting medium increases with moisture content in the medium, and decreases with the moisture content when it increases to a certain degree, and that the ANFIS models can give high accuracy predictions and this provides a new path for estimating transient radon emanation capability of loose fragmented radon-emitting medium. (authors)