(Supplementary Table 3) Electron spin resonance (ESR) dating
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Samples were grinded and sieved, and 20 aliquots of 0.2 g with a particle diameter between 100 - 200 µm were ?-irradiated with a 60Co (Cobalt) gamma source at the university...
样品经研磨过筛后，称取20份每份0.2g、粒径介于100~200微米（µm）的等分试样，于该校使用钴-60（60Co，Cobalt）γ源开展γ辐照……
