Preliminary Study of ⁴¹Ca-AMS Measurement in Rock Samples

Perhaps the value of ⁴¹Ca applications in nuclear astrophysics and geochronology is high. The CaF₂ preparation of rock samples was investigated to measure the background level of ⁴¹Ca in the natural rock samples by AMS. A preparation method of secondary fluorination was proposed by some physical and chemical processes. On this basis, a program to improve CaF^-₃ beam intensity was designed by improving conductive medium and target cone. This sample preparation program can effectively improve the beam intensity of CaF^-₃. The experimental results show that with these settings the ⁴¹Ca/⁴⁰Ca background level of rock samples is less than 8×10^-14.