coulomb per kilogram

Name	Symbol	Quantity	Base units
coulomb per kilogram	C/kg	exposure (x- and γ-rays)	kg⁻¹ s A
The coulomb per kilogram, symbol C/kg, is the SI coherent derived unit of exposure to x-rays or γ-rays (gamma rays). One coulomb per kilogram is the amount of ionising radiation exposure that frees one coulomb of electric charge in one kilogram of air.
Definition			h^-1 c² Δν_Cs^-1 e
$1 \mspace{4mu} \text{C} / \text{kg} \mspace{6mu} = \dfrac{(6.626 \mspace{4mu} 070 \mspace{4mu} 15 \times 10^{-34})(9 \mspace{4mu} 192 \mspace{4mu} 631 \mspace{4mu} 770)}{(299 \mspace{4mu} 792 \mspace{4mu} 458)^2(1.602 \mspace{4mu} 176 \mspace{4mu} 634 \times 10^{-19})} \mspace{6mu} \dfrac{c^2 \mspace{4mu} e}{h \mspace{4mu} \Delta \nu _{Cs}}\\ \\ \\ 1 \mspace{4mu} \text{C} / \text{kg} \mspace{6mu} \approx 4.230 \mspace{4mu} 036 \mspace{4mu} 294 \mspace{4mu} 682 \mspace{4mu} 392 \mspace{4mu} 435 \times10^{-22} \mspace{6mu} h^{-1} \mspace{4mu} c^2 \mspace{4mu} {\Delta \nu _{Cs}}^{-1} \mspace{4mu} e$

becquerel	Bq	activity referred to a radionuclide
coulomb per kilogram	C/kg	exposure (x- and γ-rays)
gray	Gy	absorbed dose
sievert	Sv	dose equivalent
gray per second	Gy/s	absorbed dose rate