Sec. 16.7] INTERNAL DOSIMETRY 437 



simple integrable form except for the sphere when absorption is disregarded ; 

 then G = Air-a A , where a is the radius of the sphere containing the radio- 

 active material and for which the integral dose is determined. In most other 

 cases the evaluation of G is possible only by numerical integration. In 

 principle, G can be evaluated by a double summation similar to that for g 



Rh 



G = lu 



j = 1 / = 1 



in which the sum i = 1 to 5 is taken over all volume elements AVi into which 

 the exposed volume is divided and the sum j = 1 to r is taken over volume 

 elements AV'j containing active material. R^ is the distance from AVi to 

 AVj. It is apparent that the labor involved in evaluating this double sum 

 will often be prohibitive. 



REFERENCES FOR CHAP. 16 



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