Table 3. Effect of the Irradiation Dose on the Potency of the Reactions of Interaction between DPPH and the Products of Radiolysis of Coum^a.

D, kGy	esculetin	esculin	scopoletin	umbelliferone
0	82.2	12.6	7.3	0.7
0.14	79.5	20.3	10.5	1.8
0.28	82.1	14.3	2.4	12.7
0.56	84.3	16.2	8.3	16.6

^aThe concentration of coumarins was 0.01 M in 40% ethanol solution. Measurements taken after introducing DPPH into the system for 30 min.