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Chapter 16: Radiation Protection and Safety in Radiotherapy
international.anl.gov16.5 QUANTITIES AND UNITS IN RADIATION PROTECTION 16.5.1. Physical quantities The activity of an amount of a radionuclide in a particular energy state at a given time is given as: • is the decay constant of the radioactive nucleus • is the number of radioactive nuclei at time t. • is the half-life of the radioactive nucleus. A(t) A(t) = dN dt
Units and Symbols - Institution of Engineering and Technology
www.theiet.org10. Physical constants 18 11. Conversion factors 19 Length 19 Area, Volume 19 Mass, Density 19 Velocity 19 Force, Pressure, Torque 20 Energy, Power 20 Nucleonics, Radiation etc. 20 Special remark on Logarithmic quantities and units 20 12.