ACTIVITY, C/M IN THOUSANDS i ° d RAT pone \ a ‘O- m~o~ 3. NN 2- 0 -_ oO BAGKGROUND Ol “4 -NODDY TERN BONE . ‘ 100 ; 200 1 300 4 ; 400 t 500 , 600. ADDED ABSORBER , MG/CN2 Al Figure 14. 1 700 * 800 Mass absorption curves from the bones of a rat and a tern, post shot.