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 ²²⁶Ra 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 ²²⁶Ra using RAD7, which is simple to operate, does not require chemical separation. The ²²²Rn production rate is obtained by measuring the ²²²Rn concentration in a nonequilibrium state using RAD7, and the ²²⁶Ra 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 ²²⁶Ra production process.