mm tris hcl buffer containing 0 15 m nacl and applied in a sepharose cl 6b column equilibrated with the same buffer to carry out a molecular sieve chromatography sodium carboxylmethyl cellulose was detected by a phenol sulfuric acid method the results are shown in table 1 to 0 5 ml of the resulting solution was added 20 u03bcl of a fibrin monomer solution a280 nm 6 prepared by dissolving fibrin monomers in 20 mm acetic acid and admixed for 5 seconds thereafter the mixture was poured into a quartz cell having an optical path of 1 cm after 20 seconds of adding fibrin monomers an absorbance at 350 nm was measured every 30 seconds for 25 minutes as a control test the same procedure was repeated except that the powdery sodium carboxylmethyl cellulose was not used the absorbance was measured by an ultraviolet visible light spectrophotometer u 3210 hitachi ltd the results are shown in fig1 wherein the curve 1 is the result in the presence of cmc u2014 na not irradiated with electron rays the curve 2 is the result in the presence of cmc na irradiated with 10 kgy the curve 3 is the result in the presence of cmc na irradiated with 20 kgy the curve 4 is.