Non ionizing radiation

Question 1

What are the two types of lasers?

Answer 1

Continuous wave and pulsed

Question 2

What is the dose rate for a continuous wave laser called?

Answer 2

Irradiance

Question 3

What is the dose of a pulsed laser called?

Answer 3

Radiant exposure

Question 4

What are the units for Watts?

Answer 4

Joules / second

Question 5

Irradiance calculation

Answer 5

E = power/area

E = Irradiance (W/cm2)
P = power (W)
A = area (cm2)

Question 6

Laser target organs

Answer 6

Eyes and skin

Question 7

What are the different types of non-ionizing radiation?

Answer 7

• Ultraviolet
• Visible light
• Infrared
• Microwaves
• Radio waves

Question 8

What are the three kinds of UV radiation?

Answer 8

• UVA
• UVB
• UVC

Question 9

What are the negative effects of UV radiation?

Answer 9

• Redness or erythema
• Photosensitization
• Skin cancer
• Corneal lesions
• Photokeratitis (welder’s flash)
• Snow blindness from welder’s flash

Question 10

Which UV radiation is the most biologically active and potentially harmful?

Answer 10

UVB

Question 11

UVB wavelength

Answer 11

320 - 280 nm

Question 12

Name nonionizing radiation in order of lowest to highest frequency

Answer 12

ultraviolet -> visible light -> infrared -> microwave -> radio wave

Question 13

Wavelength of visible light spectrum

Answer 13

400 - 700 nm

Question 14

What is photokeratitis?

Answer 14

Photokeratitis is a painful eye condition caused by exposure to ultraviolet (UV) rays, most commonly from the sun. You can compare photokeratitis to sunburn, but it’s a burn that affects parts of your eye instead of your skin. It’s generally bilateral (affects both eyes)

Question 15

Workers at risk of developing photokeratitis

Answer 15

Welders