Popis: |
The aim of the Experiment “ Seeds ” on the Sowjetic Satellite Biokosmos 9, flown in 1989, was a detailed observation of radiobiological effects caused by cosmic radiation (CR) in seeds of Arabidopsis Thaliana at special geometrical loci inside the seed (root-or shoot-meristem for instance), in correlation to the tracks of passing particles of the CR, recorded in nuclear track detectors. Two types of exposure units were flown: A low-shielding unit Type I, mounted at the surface of the satellite ( 1.4 g/cm 2 shielding ) and, for comparison, an identical item inside (16 g/cm 2 shielding) using nuclear emulsion as track detectors. A Type II unit, flown inside ( 18 g/cm 2 shielding ) was supplied with AgCl track detectors. A methodic description of the layout, and the procedure of handling and evaluation of the detectors is given. Some physical ( dosimetric ) results are presented. |