D. O. SHIELS 



Table 4. Index 1 Comparison of means 



Groups compared 



Unexposed 



56 



48 



40 



{^ 



36 adults 

 20 children 



do. 



r28 adults 

 \20 children 

 /20 adults t 

 \20 children 



Exposed 



,,-^/ 7 adults * 

 "^^S children 

 ' 5 adults 

 children 

 adults * 

 children 

 adults 

 children 



Unexposed 



19-3 

 19-3 

 16-88 

 15-5 



Mean values 



Exposed 



10-0 

 6-07 



10-00 

 6-07 



66 

 64 

 58 

 48 



3-52 



5-74 



3-629 <0-001 



5-07 <0-001 

 < 0-001 



<0-001 



* Includes values for 2 adults who had very little exposure. 



t The 2U values for adults were the lowest of the 36 giving the most unfavourable values for comparison of the 

 means. 



EFFECTS IN OCCUPATIONALLY EXPOSED PERSONS 



Evidence additional to that previously produced^- -' ^^ ^ will now be presented 

 that quite marked changes in the values found for these newer tests occur as 

 a result of a few months' work in occupations involving exposure to ionizing 

 radiation. 



Fourteen persons working as nursing sisters or radiographers in mass 



900 



800 



60r 



50 



i,0 



30 



20 



Change in index la White cell counts 



lAOOOr -- ■'oo 



12000 



36 8- 



10000 



8000- 



6000- 



AOOO- 



2000- 



1007 



Change fall of 72 6% 



Before 

 exposure 



After some 

 months 



Eosinophils 

 absolute counts 



200- 

 ^933 



-26 2 



Change 35 5% increas e 



Tests A-7 

 months later 



First 

 test 



TestsA-7 

 months later 



Figure 5. Results of tests on occupationally exposed persons 



43 



