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?

<p>Vacuum UV radiation (B)</p> Signup and view all the answers

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

<p>Treating psoriasis (B)</p> Signup and view all the answers

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

<p>Two hours after taking psoralen (C)</p> Signup and view all the answers

At which level do UVA rays penetrate the skin?

<p>Dermis level (B)</p> Signup and view all the answers

What does erythema result from according to the information provided?

<p>Dilatation of capillaries and arterioles (A)</p> Signup and view all the answers

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

<p>UV wavelength and UV absorbed amount (A)</p> Signup and view all the answers

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

<p>Erythema (D)</p> Signup and view all the answers

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

<p>Air-cooled medium pressure mercury lamp (Hanovia Alpine sun lamp) (C)</p> Signup and view all the answers

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

<p>Mercury vapor (A)</p> Signup and view all the answers

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

<p>All of the above (D)</p> 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?

<p>Tridymite formation (B)</p> Signup and view all the answers

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

<p>Both A and B (B)</p> 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?

<p>Every 1000 hours of exposure (A)</p> Signup and view all the answers

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