title: Radiation-induced syntheses in cometary simulated models.
abstract: The behavior of an aqueous-dominant multicomponent cometary model is examined at high doses of ionizing radiation. The system is composed of a water mixture of HCN (0.2 mol dm-3), CH3CN (0.04 mol dm-3), C2H5CN (0.02 mol dm-3), CH3OH (0.12 mol dm-3) and HCO2H (0.01 mol dm-3. It was exposed to gamma rays at doses up to 18.5 MGy. The chemical kinetic database used in the computer treatment of experimental data consists of 79 reactions. A complex mixture of products has been synthesized: gases, amino acids, carboxylic acids and polymeric material. The results suggest that the pristine material in cometary nuclei may have been chemically altered by the action of cosmic rays and embedded radionuclides.
authors.affiliation: Instituto de Ciencias Nucleares, UNAM, Mexico, DF.
authors.forename: A
authors.initials: A
authors.lastname: Negron-Mendoza
authors.forename: E
authors.initials: E
authors.lastname: Chacon
authors.forename: R
authors.initials: R
authors.lastname: Navarro-Gonzalez
authors.forename: Z D
authors.initials: ZD
authors.lastname: Draganic
authors.forename: I G
authors.initials: IG
authors.lastname: Draganic
mesh_terms: D000596:Amino Acids / Q000138:chemical synthesis*; D002264:Carboxylic Acids / Q000138:chemical synthesis*; D016208:Databases, Factual; D005561:Formates / Q000737:chemistry / Q000528:radiation effects; D005720:Gamma Rays; D005740:Gases / Q000138:chemical synthesis*; D006838:Hydrocarbons / Q000138:chemical synthesis; D006856:Hydrogen Cyanide / Q000737:chemistry / Q000528:radiation effects; D019110:Meteoroids; D000432:Methanol / Q000737:chemistry / Q000528:radiation effects; D008956:Models, Chemical; D009570:Nitriles / Q000737:chemistry / Q000528:radiation effects; D011108:Polymers / Q000138:chemical synthesis*; D011854:Radiochemistry; D014867:Water / Q000737:chemistry
chemical_list: D000596:Amino Acids; D002264:Carboxylic Acids; D005561:Formates; D005740:Gases; D006838:Hydrocarbons; D009570:Nitriles; D011108:Polymers; D014867:Water; C030544:formic acid; D006856:Hydrogen Cyanide; C005557:propionitrile; D000432:Methanol