A new method for the measurement of the activity of high-concentration 226Ra in solution based on 222Rn production rate

Traditional methods for measuring the Ra-226 activity are time-consuming and the equipment is large and inconvenient to carry. This article proposes a new method for quickly measuring the activity of high-concentration Ra-226 using RAD7, which is simple to operate, does not require chemical separation. The Rn-222 production rate is obtained by measuring the Rn-222 concentration in a nonequilibrium state using RAD7, and the Ra-226 activity is yielded according to the law of radioactive decay. Verification experimental results demonstrate that, compared with the FD125 measurement method, the proposed method reduces the measurement time by 92%, with result deviation within 6%. Therefore, the proposed method can provide technical support for rapid measurement during the Ra-226 production process.