title: Experiment "Seeds" on Biokosmos 9.  Dosimetric part.
abstract: The aim of the experiment "Seeds" on the Sowjetic satellite Biokosmos 9 was the observation of mutagenic effects caused at special loci of seeds of Arabidopsis thaliana and assigned to particles of the Cosmic radiation.  Two types of exposure units were flown:  A low-shielding unit Type I, mounted at the surface of the satellite (1.4 g/cm2 shielding) and, for comparison, an identical item inside (16 g/cm2 shielding), using nuclear emulsion as track detectors.  A Type II unit, flown inside (18g/cm2 shielding) was mounted with AgCl track detectors.  The layout will be briefly described.  A first set of dosimetric data from the physical evaluation of the experiment will be presented.  The subdivision into charge- and LET-groups shows a rather high contribution of the intermediate LET-group (350-1000 MeV/cm) due to medium heavy particles (Z = 6-10) and to enders of light (p, alpha) particles.
authors.affiliation: University of Frankfurt, Germany.
authors.forename: B
authors.initials: B
authors.lastname: Baican
authors.forename: E
authors.initials: E
authors.lastname: Schopper
authors.forename: T h
authors.initials: Th
authors.lastname: Wendnagel
authors.forename: J U
authors.initials: JU
authors.lastname: Schott
authors.forename: C
authors.initials: C
authors.lastname: Heilman
mesh_terms: D017360:Arabidopsis / Q000235:genetics / Q000528:radiation effects*; D003359:Cosmic Radiation; D005858:Germany; D018499:Linear Energy Transfer; D009154:Mutation; D011829:Radiation Dosage; D011834:Radiation Monitoring; D011835:Radiation Protection; D011874:Radiometry; D012639:Seeds / Q000528:radiation effects*; D018030:Silver Compounds; D013026:Space Flight; D018531:Spacecraft / Q000295:instrumentation; D014586:USSR
chemical_list: D018030:Silver Compounds; C037548:silver chloride