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Label Surface limit Transport index (1 m) White I 0.5 mR/h Not applicable Yellow II 50 mR/h 1 mR/h Yellow III 200 mR/h 10 mR/h Test Purpose Source Frequency Passing level Accuracy Accuracy 137Cs, 57Co, 133Ba Annually ±10% Constancy Precision 137Cs or 57Co Daily, before use ±10% Linearity Precise over range of activities 99mTc or 18F Quarterly ±10% Geometry Precise over different configurations/volumes 99mTc New or after repairs ±10% Measurement U.S. unit SI unit Conversion Activity Curie Becquerel 1 mCi = 37 MBq Ionizations in air Roentgen C/kg 1 R = 2.59 × 10−4 C/kg Absorbed dose Rad Gray 100 rad = 1 Gy Equivalent dose (absorbed dose times radiation quality factor) Rem Sievert 100 rem = 1 Sv Effective dose (equivalent dose times tissue weighting factor) Rem Sievert 100 rem = 1 Sv
