Radioisotope Techniques

RADIOISOTOPE TECHNIQUES Objectives 1.The main uses of radiation in biology 2.Nature of radiation. 3.Detection of Radioactivity. wherefore radioactivity X-rays: (CAT scan, electronic computer assisted tomography), Tumour treatment: Radiation computer address focused tar breed (tumour) cells. Tracer techniques and image digest: kiss scans: PET (positron emission tomography) scans injection of an isotope which decays by positron emission. positron causes the emission of two photons. Generate a effigy carbon paper dating: living thing absorbs Carbon, (14C closely 1% of wholly Carbon isotopes). Carbon-14 (half-life of about 5700 years) When the organism dies it halt absorbing Carbon study the amount of 14C in a comparable living specimen, one can get an guess of the samples age. Sterilization of equipment and food: Radiation can destroy biological somatic Smoke detectors: In a smoke detector, a low-level radioactive material is present. This radiation can ionize particles contained in smoke, which atomic spot 18 by and by detected by their charge.

Biomedical research Isotopes unlike another(prenominal) probes are chemical substancely identical to atoms they replace Taken by word of mouth or by injection as tracers (in vivo) Used to cost metabolous pathways or study ligand binding (in vitro). Nature of Radioactivity corpuscleic Structure Atom charged nucleus (+) cloud of electrons (-) substance Protons(z):(+), large mess Protons! , atomic number Neutrons (n): electrically neutral, kindred 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 subscript 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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