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The Curie (Ci) is the traditional unit of Activity (where its SI equivalent in the Becquerel). 1 Ci is equivalent to 3.7 E10 disintegrations per second (dps) and since 1Bq=1dps it follows that 1Ci = 3.7 E10 Bq or 37GBq (approximately). The Ci was based on the activity found in 1 g of Radium.

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