High-resolution radon, thorium and daughter combined measurement device and measurement method thereof

The invention discloses a high-resolution radon/thorium daughter combined measurement device, a measurement method thereof and a radon/thorium daughter synchronous measurement method. The method comprises the following steps: (1) first sampling and emanation measurement: firstly, starting a radon/thorium daughter measurement unit loosening and tightening motor, opening a second valve and a third valve, and closing a first valve; (2) paper feeding: firstly starting a tightening motor and a paper feeding motor; and (3) sampling, emanation and daughter measurement: performing synchronous sampling radon/thorium measurement and radon/thorium daughter measurement, firstly opening a second valve and a third valve, closing the first valve, and starting a PIPS detector in the radon/thorium daughter measurement unit to measure an alpha energy spectrum. The device is reasonable in structure and novel in design, high-resolution, high-response, synchronous, rapid and online combined continuous measurement of radon emanati