Preliminarily Study of the Effect of ?-ray of ~(60)Co on the Growth of Spirulina / 航天医学与医学工程

ABSTRACT

Objective A foundation for one of the biological components,Spirulina,to be applied in Controlled Ecological Life Support System(CELSS)would be laid with exploring effects of ionization radiation on the growth of Spirulina.Methods By using the ?-rays of ~(60)Co,Spirulina were irradiated.The dose of the ionization radiation covered 0,0.5,1.0,1.5,2.0,2.5,3.0 kGy.After irradiated,these Spirulina were cultured under the same conditions.The growth state,shape change,photodensity change,photosynthetic efficiency(O2 produced),and trophic physiological indexes of Spirulina or its solution,were observed,measured and analyzed.Its anti-irradiation ability was investigated.Results After irradiared with ~(60)Co ray,the growth rate,photosynthetic O2 produced efficiency,length of fila and other trophic physiological indexes were all affected in certain degree,but as compared to the higher plants,Spirulina have stronger radiation proof and self-rehabilitation capacity.Even if under high radiation condition(3.0 kGy),there was no complete death of cells,and the dose resulted in 50% death of the Spirulina was 2.0 kGy.Conclusion Spirulina has stronger ionization radiation proof and self-rehabilitation capacity,it can be considered as one of the key biological components in CELSS for future long-term space missions.