Presentation Title

RADIATION BY SUDARSAN

SOURCE OF RADIATIONRadiation is the part of mans environment.Divided into two groups : - natural - man made

NATURALCosmic raysEnvironmental - terrestrial - atmosphericInternal - potassium 40 - carbon 14

MAN MADEMedical - X-rays - Radio isotopeOccupational exposureNuclear - Radioactive falloutMiscellaneous - TV sets - radioactive dial watches - luminous markers - isotope tagged products

PHOTO CORNER

TYPES Radiation

Ionising Non-ionising

electromagnetic corpuscular

ELECTROMAGNETIC RADIATIONX-raysGamma rays

- Both have short wave length - Have deep penetrating property - X-rays are manmade; gamma is produced during disintegration - Otherwise both has no material difference Cosmic rays also containing ionoizing radiation

CORPUSCULAR RADIATIONAlpha particles 10 times harmful than X-rays less penetrating force dangerous if enters bodyBeta particlesProtons

NON IONISING RADIATIONUltra violet radiationVisible lightInfrared radiationMicrowave radiationRadio frequency radiation

RADIATION UNITBecquerel(Bq): -Measurement of nuclear activityRoentgen: -Measurement of potency -other Rad,RemThese are now replaced by SI unit: a) Coloumb/kg b) Gray c) Sievert

BIOLOGICAL EFFECTSTwo types : - short term - long termAcute radiation syndromeEffect of ionising radiation : - somatic immediate/delayed - genetic

BIOLOGICAL RESPONSERADIATION(rad) EFFECTS2000 death is certainity >5000 CNS can no longer control body ; death is for sure; only supportive care can be given

RADIATION PROTECTIONMax permissible radiation received from outer space is to be 0.1 rad/yearMax permissible radiation received from man made is to be 5 rad/yearOther precautions include.

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