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PHT 221: Production of Ultraviolet Radiation

16 Questions

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PHT 221: Production of Ultraviolet Radiation

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Questions and Answers

What is the classification of vacuum UV radiation?

50-100 nm wavelength

100-200 nm wavelength (correct)

200-300 nm wavelength

300-400 nm wavelength

Which region does Ultraviolet radiation (UVR) lie in the electromagnetic spectrum?

Between infrared and microwaves

Between visible light and X-ray (correct)

Between gamma rays and X-ray

Between visible light and radio waves

Which part of the body are UVR radiations introduced through according to the text?

Skin only

Muscles only

Bones only

Hair follicles, subcutaneous tissue, and sebaceous glands (correct)

What is absorbed rapidly in air according to the text's classification of UVR?

Vacuum UV radiation Signup and view all the answers

What is the purpose of Psoralen + UVA (PUVA) treatment?

Treating psoriasis Signup and view all the answers

When is PUVA treatment typically conducted in relation to the patient taking psoralen?

Two hours after taking psoralen Signup and view all the answers

At which level do UVA rays penetrate the skin?

Dermis level Signup and view all the answers

What does erythema result from according to the information provided?

Dilatation of capillaries and arterioles Signup and view all the answers

What is a key factor influencing the extent of reaction to UV rays?

UV wavelength and UV absorbed amount Signup and view all the answers

What physiological effect is caused by UVR leading to reddening of the skin?

Erythema Signup and view all the answers

Which of the following lamps is specifically mentioned for treating generalized skin conditions like acne and psoriasis?

Air-cooled medium pressure mercury lamp (Hanovia Alpine sun lamp) Signup and view all the answers

What is the primary component within a mercury vapor lamp that produces ultraviolet radiation?

Mercury vapor Signup and view all the answers

What is the primary reason for incorporating a cooling device into an ultraviolet lamp?

All of the above Signup and view all the answers

What is the phenomenon that causes a reduction in the output of ultraviolet radiation from a mercury vapor lamp over time?

Tridymite formation Signup and view all the answers

Which of the following cooling methods is mentioned in the text for ultraviolet lamps?

Both A and B Signup and view all the answers

Based on the information provided, how often is it recommended to change the quartz tube in an ultraviolet lamp?

Every 1000 hours of exposure Signup and view all the answers