INDIRECT EFFECT OF X-RAYS ON THE JENSEN-SARCOMA 



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Table 8. — Volume Measurements on Double Sarcomas 



(Weight of rats about 150 gm Male. Inoculated 3 May 1944. Each was irradiated with 



500 r on 17, 20 and 22 May. a = anterior sarcoma, b = posterior sarcoma) 



13 r. The intensity of the scattered radiation received by the protected 

 sarcoma during the irradiation of the unprotected sarcoma thus amounted 

 to only about ^/^ per cent of the radiation dose supplied to the unprotected 

 sarcoma. Immediately after irradiation 0.1 cm^ of sodium phosphate 

 solution (pH 8) containing 0.3 mgm P and an activity of about 3 fzc was 

 injected subcutaneously. Two hours later the rat was killed and the 

 deoxyribonucleic acid of the two sarcomas and the "free" P of the two 

 sarcomas, the plasma and the liver were isolated. Comparison of the 

 ratio of the activity in 1 mgm of nucleic acid P and in 1 mgm of free sar- 

 coma P is a measure of the newly formed nucleic acid during the experi- 

 mental time of 2 hr. Comparison of the activity of the nucleic acid P 

 with that of the plasma P or of the liver P can be used as a control. 



