Chapter 8 



Laboratory Experiments on U ptake 



85 



TABLE 6 Accumulation of Sr^" in the Various Organs and Tissues of Tuna After Ingestion 



Percentage of total activity 



Dose: 

 5.55MC 



Tissue 1 hr 



Heart 0.04 



Gall bladder 0.05 



Blood 4.21 



Gill flesh \i2 AA 



Gill bone j 



Caecum 37.01 



Foregut 0.89 



Midgut 2.28 



Hindgut 11.78 



Gut contents — 



Head, operculum . . — 



Appendicular skel. . 3.60 



Liver 3.34 



Spleen 0.20 



Tail — 



Brain, spinal cord. .1 ^ ,, 



Eyes .. I 0-23 



Integument 5.28 



Integument flesh . . — 



(aliquot) 



Integument scales . — 



(aliquot) 



Gonad I 2.40 



Kidney J 



Light muscle \ i r ?^ 



Dark muscle .... 



0.02 



0.09 

 0.08 

 3.23 

 0.10 



0.02 



0.47 

 0.16 

 8.74 

 0.86 



— 0.11 



0.22 



4.19 

 5.25 



.08 

 .09 

 10.01 

 0.70 



Dose: 

 464^c 



24 hr 

 0.05 

 0.03 



2.73 



0.34 

 0.20 

 0.65 

 0.15 



18.33 



23.69 



0.15 



0.03 



Dose: 

 AGAjxc 



96 hr 

 0.028 

 0.0001 

 1.14 



30.61 25.72 



0.15 

 0.24 

 0.25 

 0.024 

 0.10 

 24.58 

 30.32 

 0.04 

 0.008 



1.66 1.70 

 7.69 11.37 



/0-08| 0.06 f 

 \0.09/ \0 



12.84 

 0.72 



004 

 027 

 3.94 

 0.48 



Dose: 

 464/iC 



264 hr 

 0.01 

 0.01 

 0.35 

 2.42 



16.80 

 0.05 

 0.04 

 0.05 

 0.03 

 0.013 



28.18 



29.15 

 0.03 

 0.03 



Dose: 

 371^0 



480 hr 

 0.014 

 0.004 

 0.51 

 1.42 



19.48 

 0.04 

 0.04 

 0.036 

 0.015 



29.91 



30.47 

 0.04 

 0.010 



0.03 

 0.07 

 5.26 

 0.47 



0.023 

 0.035 

 5.69 

 0.63 



Dose: 

 371MC 



648 hr 



0.007 



0.002 



0.12 



2.21 



22.76 

 0.029 

 0.018 

 0.003 

 0.016 

 0.0008 



24.58 



31.43 

 0.027 

 0.003 



1.33 0.030 0.004 



2.02 1.34 1.34 



13.73 10.25 10.51 



— — 0.065 



0.091 



0.020 

 0.022 

 5.79 

 0.95 



TABLE 7 The Internal Distribution and Per- 

 centage Recovery of a Dose of 75 mc of Sk^^ 

 By Tilapia 



Days after 

 dose 



Tissue 

 .Skin 

 Eyes 



Visceral organs 

 Gills 

 Muscle 

 Skeleton 



Total 



.Skin 

 Eyes 



Visceral organs 

 Gills 

 Muscle 

 Skeleton 



Total 



.Skin 

 Eyes 

 Visceral 

 Gills 

 Muscle 

 Skeleton 



Total 



organs 



Percentage 



of total 



recovered 



25.27 



0.35 



1.82 



15.62 



5.65 



51.30 



100.01 



24.44 

 0.18 

 1.08 

 8.13 

 3.10 



63.07 



100.00 



24.56 

 0.25 

 1.01 

 6.42 

 8.40 



59.35 



99.99 



Days after 

 dose 



TABLE 7 — Continued 



Tissue 

 .Skin 

 Eyes 



Visceral organs 

 Gills 

 Muscle 

 Skeleton 



Percentage 



of total 



recovered 



22.79 



0.33 



1.14 



10.11 



3.01 



62.62 



Total 



100.01 



uptake apparently levels off at a value which 

 corresponds to a concentration factor of about 

 0.3. This means that these fish can to some 

 extent exclude the strontium ion in solution. 

 Even the skeleton had not yet come to equi- 

 librium with the radioactivity in the sea water. 

 This may mean that only about 70 per cent of 

 the strontium in the bone is readily exchangea- 

 ble. The remainder may be firmly bound in a 

 lattice or to an organic matrix which has a slow 

 rate of turnover. It should be emphasized that 

 these fish were mature. 



Experiments done at the R.L.F.W.S. with 

 Sr*^ on post-larval flounders indicate that age 



