Physics and Engineering of Radiation Detection

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Appendix B

Constants and Conversion Factors

B.1 Constants

Constant Symbol Value Units

Atomic mass constant mu 1. 660 × 10 −^27 kg

Atomic mass constant (energy equivalent) muc^21. 492 × 10 −^10 J

931. 49 MeV

Avogadro’s number NA 6. 022 × 1023 mole−^1

Boltzmann’s constant kB 1. 380 × 10 −^23 JK−^1

8. 617 × 10 −^5 eV K−^1

Elementary charge e 1. 602 × 10 −^19 C

Plank’s constant h 6. 626 × 10 −^34 Js

4. 135 × 10 −^15 eV s

Speed of light in vacuum c 2. 99 × 108 ms−^1

Thomson cross section σe 6. 652 × 10 −^29 m^2