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Useful Information 

Radiological Conversions

1 Ci = 3.7 x 1010 dps

1 Ci = 2.22 x 1012 dpm

1 mCi = 3.7 x 107 dps

1 mCi = 2.22 x 109 dpm

1 uCi = 3.7 x 104 dps

1 uCi = 2.22 x 106 dpm

1 Rad = 100 ergs/gram

1 Grey = 100 rads

Definitions

Rem = Roentgen Equivalent Man

Rem = Roentgen * Quality Factor

LD 50/30 (acute dose) = 450 Rems

Quality Factor  
Radiation Quality Factor
X-Ray, Gamma or Beta 1
Slow Neutrons (low KE) 3
Fast Neutrons 10
Alpha Particles 20
Isotopes

Isotopes Chart

Radiological Properties of Isotopes