Radioisotope Techniques

RADIOISOTOPE TECHNIQUES Objectives 1.The main uses of radiation in biology 2.Nature of radiation sickness. 3.Detection of Radioactivity. wherefore radiation sickness X-rays: (CAT scan, electronic computer assisted tomography), Tumour treatment: Radiation computer address focused tar go (tumour) cells. Tracer techniques and image abstract: kiss scans: PET ( antielectron emission tomography) scans injection of an isotope which decays by positron emission. positron causes the emission of two photons. Generate a describe carbon paper dating: living thing absorbs Carbon, (14C well-nigh 1% of wholly Carbon isotopes). Carbon-14 (half-life of about 5700 years) When the organism dies it shekels absorbing Carbon study the amount of 14C in a comparable living specimen, one can get an look of the samples age. Sterilization of equipment and food: Radiation c an destroy biologic somatic Smoke detectors: In a smoke detector, a low-level radioactive material is present. This radiation can ionise particles contained in smoke, which atomic bet 18 by and by detected by their charge. Biomedical research Isotopes unlike separate probes are chemical substancely identical to atoms they replace Taken orally or by injection as tracers (in vivo) Used to get metabolous pathways or study ligand binding (in vitro). Nature of Radioactivity corpuscleic Structure Atom charged nucleus (+) cloud of electrons (-) center Protons(z):(+), large mess Protons, atomic number Neutrons (n): electrically neutral, resembling mass as protons. mass number (a) = z + n the number of neutrons does not affect the chemical properties of the atom. If the mass number is different (different number of neutrons) They are called: isotopes. symbolically: a deficient number for the atomic number ! a superscript...If you want to get a full essay, order it on our website: OrderCustomPaper.com

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