LSRA test practice(book)) Flashcards
What is ANSI and what does it do?
Americal National Standard Institue,
it sets the laser safety standards that most European countries follow.
What is the name of the standard that is used by most European countries?
(American National Standards Institute, Z136.1, Safe Use of Lasers 1993).
What is the main criterion for the classification of lasers’ safety?
The potential hazard associated with the use of lasers
What are the parameters used for the characterizing the potential hazard of the laser?
- AEL (Accessible Emission Limit)
- MPE (Maximum Permissible Exposure)
What are the units of radiant energy, radiant power, radiant exposure, irradiance, radiant energy density, radiant intensity
, and radiance?
radiant energy- J
radiant power- W
radiant exposure- J/m2
irradiance- W/m2
radiant energy density- J/m3
radiant intensity- W/sr
radiance- w/m2sr
What are the classifications of the hazards posed by radiation?
.radiation hazards,
. chemical hazards,
. electrical hazards,
. other hazards associated with the specificity of a laser system.
Is the radiation emitted by laser ionizing?
No, it is non-ionizing
What is optical density(lambda)?
It is the parameter used to specify eye protective filters.
What is the Formula of optical density?
Logarithm (base 10) of the ratio of Ho to the MPE,
where Ho = most likely irradiance or radiance exposure
MPE = Maximum Permissible Exposure
On what factors, the value of MPE depends?
- wavelength of radiation
- the pulse duration
- exposure duration
- kind of tissue subjected to exposure
What are the hazards possessed by laser radiation to the eye?
- Photokeratitis
- Cataract
- Blindness in the eye
How does light from the mid- and far-infrared cause cataracts?
Fill in later
How does light from laser cause Photokeratitis?
Fill in later
How does laser cause cataracts?
Fill in later
How does laser cause blindness to the eye?
Fill in later
