Biophotonics and microwave imaging

Question 1

What is there different between radiometry and photometry? Provide some measurement units for both.

Answer 1

• Radiometry: Measurement of the energies of radiation (e.g. radiant energy (J), radiant power (W), irradiance (W/m^2)).
• Photometry: Measurement of aspects related to vision (e.g. luminous energy (J), luminous power (lm), illuminance (lm/m^2)).

Question 2

What are the general safety concerns for UV, VIS, IR and RF?

Answer 2

• UV, VIS and IR pose risks to the skin and eyes (UV posing the highest risk).
• RF can cause tissue heating.

Question 3

What are some control measures to minimise exposure?

Answer 3

• Time, distance and shielding.
• Reducing energy levels.
• Systems of work (e.g. staff training etc.).