non ionsizing radiation Flashcards
examples
UV, IR
WHAT OCCUPATION IS CONSIDERED RISKY IN TERMS OF UV
WELDING leads to ‘welders flash’ affctes the cornea and conjunctive
UV
is the higjest energey , and exitss in 3 bands
acute effects of uv
erythema
health effects of IR
thermal effect on retina is mre cmmon in short exposure. the lens is very vulnerbale and we see that catarcats forms in gLASS BLOWERS :’glass blowers catarcats’
other wavelengths cause mroe superficial injursy like burns
measures of IR
SOURCES OF IR SHOULD BE SHIELDED CLOSE UP USING REFLECTIVE MATERIALS LIKE ALUMINIUM .
GLASSES TO PROETECT EYE
Radiofreuwncy radiation soruces
sources: microwaves and communication freuqneices like FM and AM , mobile phones
als natural sources on the earth
health effects
non thermal : the induction of electrical currents in tissues . shocks and bursn
thermal:
Jews in the human body are not heated uniformly and some are more sensitive to heat than others
control methods of radiofrequency
Leakage of radio-frequency radiation should be controlled at the source using shielding methods to absorb the radiation
lasers intro
Light amplification b stimulated emission of radiation
currently produces: uv , vL, ir of spectrum
its different from other EM sources because its coherant (all the waves are in phase)
properties of laser
Monochromatic - the light is all the same WL, with all the waves in phase. A laser is always a single colour
Coherent - the light waves are in phase with one another whereas in normal light it has different WL
Collimated - minimal divergence, photons move in parallel fashion
Polarised
uses of lasers
therapeutic ; laser hair removal
medical : diagnosing tumours , surgery
control of laser
proper training
protective clothing
beam stop or attenuator
warning labels
avoid specular reflections- REFLECTION OF
