1 nanometer (nm) = 10 −^9 m
1 angstrom (Å) = 10 −^8 cm
1 fermi (F) = 10 −^13 cm
1 inch =2.54 cm
Activity
1 curie (Ci) =3.7 × 1010 disintegrations per second
(dps)
=2.22 × 1012 disintegrations per minute
(dpm)
1 millicurie (mCi) =3.7 × 107 dps
=2.22 × 109 dpm
1 microcurie (mCi) =3.7 × 104 dps
=2.22 × 106 dpm
1 becquerel (Bq) =1 dps
=2.703 × 10 −^11 Ci
1 kilobecquerel (kBq) = 103 dps
=2.703 × 10 −^8 Ci
1 megabecquerel (MBq) = 106 dps
=2.703 × 10 −^5 Ci
1 gigabecquerel (GBq) = 109 dps
=2.703 × 10 −^2 Ci
1 terabecquerel (TBq) = 1012 dps
=27.03 Ci
Constants
Avogadro’s number =6.02 × 1023 atoms/g · atom
=6.02 × 1023 molecules/g · mole
Planck’s constant (h) =6.625 × 10 −^27 erg · s/cycle
Velocity of light = 3 × 1010 cm/sec
p =3.1416
e =2.7183
Appendix A. Units and Constants 301