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Power (W) Refers to the power output of the source. 1W is equivalent to 1J/s.
You will sometimes hear power discussed in milliwatts (mW). A mW is 1/1000th of a W. So, 1W is 1000 mW and 10W is 10,000mW.
Joules (J) International system unit of energy when referring to light. Irradiance (W/cm2) Also known as power density
The amount of energy that is passing through a given area per second. It is the power density at the surface of the skin. Spot size or beam area This is the area of the beam on the skin’s surface. Beam area is difficult to calculate accurately due to the fact the beam is not always round and the energy is not uniform across the whole area. For this to be accurately measured a beam profiler or analyser needs to be used. This is another parameter that may not have been accurately reported in some studies. Dose J/cm2 Also known as energy density or fluence
Dose = Irradiance x treatment time Fluence is sometimes shown as Power (W) x treatment time (S) ÷ beam area (cm)
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Question 1 of 1
1. Question
Define the following terms:
Power (W)
Joules (J)
Irradiance (W/cm2) (Also known as power density)
Spot size or beam area
Dose J/cm2 (Also known as energy density or fluence)
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