57 kg mass of body tissue absorbs an average power of 50 W f

5.7 kg mass of body tissue absorbs an average power of 50 W from a burst of x-rays lasting 0.5 s.  

(a) How much energy is absorbed from the beam?

(b) What was the absorbed dose in the tissue? [careful with units]

(c) What was the human-equivalent dose absorbed by the tissue? [careful with units]

Solution

a) energy absorbed is E = Power*time = 50*0.5 = 25 J

b) absorbed dose is enerrgy per mass = 25/5.7 = 4.38 J/Kg

c) Human equivalent dose is average power / basal metabolic rate = 50 /80 = 0.625 ,it has no units