Radiation Energy Transfer and Dose5727Co emits 122 keV gamma-rays. If a 70kg person swallowed a 4 micro Curie sample of this, what would the dose rate (rads/day) averaged over the whole body. Assume that 50% of the gamma ray energy is absorbed by the body.
4 micro Ci is equivalent to 4.0x106*3.7x1010 = 148000 disintegrations per second.
This is equivalent to 148000*122keV*1.6x10-19 J/s = 1.4x10-9 J/s released into the body, which absorbs half of this:7x10-10 J/s