305 B

C_0 = 4160 107 count height left hand at 4155 52 counts right hand at 4165 47 counts

calibrating 700 - 5316 600 - 4554 500 - 3799 400 - 3041 300 - 2282 200 - 1522 100 - 761

th small peak 3496 4620keV th large peak 3549 4687keV cm peak at 4398 5804keV /5762keV

Exercise 8.5a fwhm 16.35 energy is 5481.