On the tracer method for  14 C calibration.
D002247:Carbon Isotopes / Q000032:analysis / Q000592:standards*; D002587:Cesium Isotopes; D003036:Cobalt Isotopes; D008722:Methods; D009556:Niobium; D010070:Oxalates; D011874:Radiometry; D012996:Solutions
D002247:Carbon Isotopes; D002587:Cesium Isotopes; D003036:Cobalt Isotopes; D010070:Oxalates; D012996:Solutions; D009556:Niobium