CONTENTS 



Page 

 12. The Efl'ect of Beta Radiation on Porj)hyrin Compounds in 



Aqueous Solutions. R. Tirrell ... ... ... ... 95 



Discussion 



13. Synthesis of Organic Compounds by Ionizing Radiation. S. Dii i 



and J. H. Green 



Discussion 



14. Strontium in Man and Beast. J. F. Loutit 

 Discussion 



15. Studies in Detecting Radio-Active Fall-Out. E.C.Winkler .. 

 Discussion 



102 



103 

 115 



117 

 125 



127 

 137 



16. Fail-Out Measurements in Australia. L.J. Dwyer, J. H. Martin 



and E. W. Titterton ... ... ... ... ... ... 138 



Discussion 



1 7. Activity Levels in Relation to Laboratory Design and Practice 

 A. R. W. Wilson 



Discussion 



145 



147 

 151 



18. The Influence of Oxygen on the Radio-Sensitivity of Cells and 



Tissues. L. H. Gray ... ... ... ... ... ... 152 



19. Radio-Protective Action of 5-Hydroxytryptamine. H. A. S. van 



DEN Brenk ... ... ... ... ... ... ... 169 



Discussion ... ... ... ... ... ... ... ... 177 



20. Effects of Respired Oxygen on Radio-Protective Action of Cer- 



tain Amines: 

 {a) Lethality Studies. H. A. S. van den Brenk and Ruth Moore 1 79 



{b) Rat Lymphocytes [in vivo). Ruth Moore and H. A. S. van 



DEN Brenk ... ... ... ... ... ... ... 187 



21. The Life-Span of Mutagens Produced in Cells by Irradiation 



W.D.Jackson 



22. Radio-Active Fission-Products in The Human Food Chain 



J. F. Loutit 



Discussion 



23. Injury and Recovery in Neutron-Irradiated Animals. Howard H 



VoGEL, Jr., Donn L. Jordan and Samuel Lesher ... 



Discussion 



190 



209 

 218 



221 

 234 



