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    A technician is using a laser which is classed '3B'

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    6. A technician is using a laser which is classed '3B (Restricted)' within the guidelines of Australian Standard AS2211.1-1997

    a) What is the maximum radiant exposure the technician could receive in the 0.20s it takes to blink?
    b) If the MPE for the technician is 6mJm-2, what optical density would be appropriate for the glasses she should use?

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    The 3B restricted laser has irradiance of 50W/m^2, hence in 0.2 seconds the radiant exposure ...

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    The 3B restricted laser has irradiance of 50W/m^2, hence in 0.2 seconds the radiant exposure will be

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