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gray
Symbol:  Gy 
Category:  Radiation, specific energy 
SI Equivalent:  1 Gy
Dimension L2T-2 
System:  SI 
 
Notes
Named after L. H. Gray (1905-1965), this unit is approximately the absorbed dose delivered when the energy per unit mass imparted to matter by ionizing radiation is 1 joule per kilogram.
1 Gy = 100 rad
Convert     Gy  
1 Gy =
Dose equivalent
  Symbol Unit Name
100  rem  rem 
Sv  sievert 
Radiation, specific energy
  Symbol Unit Name
  kerma 
1×10-3  kGy  kilogray 
1×10-4  Mrd  megarad 
100  rd  rad 
Thermal heat capacity
  Symbol Unit Name
4.29923×10-4  Btu (IT)/lbm  British thermal unit (IT) per pound mass 
4.3021×10-4  Btu (therm.)/lbm  British thermal unit (therm.) per pound mass 
2.38849×10-4  cal (IT)/g  calorie (IT) per gram 
2.39006×10-4  cal (therm.)/g  calorie (therm.) per gram 
1×10-3  J/g  joule per gram 
J/kg  joule per kilogram 
2.38849×10-4  Cal (IT)/kg, kcal/kg  kilocalorie (IT) per kilogram 
2.77778×10-7  kWh/kg  kilowatt-hour per kilogram 
Glossary