[en] Kinshasa Regional of Nuclear Studies (CREN-K) personnel classification is presented with respect to the possible radioactive risks bound to the occupational as well as to the dosimetric evaluation of radio exposition of the personnel on a period starts from 1975 up to 1986. The results obtained show that dose received by the whole personnel is very low in comparison with the limit values of the international norms. The statistical repartition of the CREN-K according to exposition dose received shows that about 95,5% of personnel have received a dose ranging from 0 to 2.5 mSv; 3% from 2.5 to 5 mSv and 0.5% from 5 to 7.5 mSv. This fact proves that the CREN-K personnel is adequately protected against axternal irradiation.

[en] Mannozym radioprotection effect was tested on bone marrow strains of BALB/c mice. The number of splenic colonies formed in mice sacrified eight days after total irradiation is higher in mannozym protected mice than in those which have received hemopoietic cells suspension only. The radiation dose reduction factor (DRF) is 1,6. These results indicate mannozym radioprotection effect on bonne marrow strains cells.