Appendix II: Common Conversion Factors

1 ampere (amp) = 1 coulomb per second
= 6.25 x 10¹⁸ electrons per second

1 Bq = 1 disintegration per second (dps)

1 calorie (cal) = 4.184 x 10⁷ ergs

1 curie (Ci) provides disintegrations at the rate of 3.70 x 10¹⁰ per second
1 millicurie (mCi) = 3.70 x 10⁷ disintegrations per second
1 microcurie (mCi) = 3.70 x 10⁴ disintegrations per second
1 nanocurie (nCi) = 37 disintegrations per second
1 curie = 3.7 x 10¹⁰ Bq

1 day = 1440 minutes
= 86400 seconds

1 electron volt (ev) = 1.602 x 10^-12 ergs
1 million electron volts (MeV) = 1.602 x 10^-6 ergs

1 esu = 1 statcoulomb
1 electrostatic unit of charge (esu) = 2.083 x 10⁹ electrons
1 erg = 6.24 x 10⁵ MeV

1 gram = 5.60999 x 10²⁶ MeV
1 gram = 6.0242 x 10²³ mu
1 gray = 100 rad

1 rad = 100 ergs absorbed per gram of any absorber
= 6.24 x 10⁷ MeV absorbed per gram

1 roentgen (R) produces ionization - 1 esu of charge per 0.001293 gm dry air
= 1 esu of charge per cm³ air (STP)
= 1 statcoulomb/cc of air (STP)
= 2.083 x 10⁹ ion pairs per cu cm air (STP)
For photon energies from 200 KeV to 3 MeV (hvl)

1 seivert = 100 rem

W = 34 electron volts per ion pair

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