xii Preface 



Dr Alvin M. Weinberg and Dr Robert A. Charpie, Director and Assistant 

 Director of the Oak Ridge National Laboratory. Appreciation is due Dr Karl 

 Z. Morgan, Director, Health Physics Division and to Dr Alexander Hollacnder, 

 Director, Biology Division. Any success that has been achieved is due to the 

 contributors and to those named above. Responsibility for errors or omissions 

 is that of the undersigned. 



H. P. Y. 

 Health Physics Division 

 Oak Ridge National Laboratory 

 Oak Ridge, Tennessee 



