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Xray photons are higly energetic ionizing radiation. Diagnostic xrays are extremely short = between 10^-8 && 10^-12m in wavelength. THE UNIT formerly used ANGSTROM ==> 1A= 10^-10m
tissue damage can manifest within days. late effecs: Cancer takes years to develop
greatest exposure is from backfground rad.
daignostic xrays produced when high speed electrons are rapidly decelerated by tungsten target @ the focal spot The KINETIC ENERGY of the electrons is CONVERTED TO X-RAY PHOTON ENERGY.
SOURCE OF ELECTRONS: heated cathode filament
2 WAYS OF CONVERTING:
BREMSSTRAHLUNG or braking radiation: 70-90% of the beam
CHARACTERISTIC RADIATION knocks kshell electron and a higher energy level replaces it. when it replaces it there is a difference of energy, whatever is left over after going down 1 level is emitted as xray. 10-30%of the beam
INTERACTIONs between xray photons and matter
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