Cleanrooms and equipment

Which statement about the amount of particles shed by cleanroom workers is correct?

  1. AWith a cleanroom suit it becomes zero regardless of how they move
  2. BIt is greater when sitting than when walking
  3. CIt increases with larger body movements, so workers avoid running and sudden motions
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Answer: C. It increases with larger body movements, so workers avoid running and sudden motions

People constantly shed particles such as skin flakes and clothing fibers, and the amount rises greatly from standing still to walking, and further with vigorous motion. Cleanroom suits reduce what escapes but cannot stop it completely, so cleanrooms also set behavior rules such as no running and no sudden movements.

  • A. Even with a cleanroom suit it does not become zero.
  • B. More is shed when moving.
  • C. Correct. Shedding increases with larger movements.
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More Cleanrooms and equipment questions

  1. As circuits are scaled down, how does the size of particles that must be controlled in the cleanroom change?
  2. What is the main reason wafers must not be touched with bare hands?
  3. Which statement about ISO 14644-1 cleanliness classes is correct?
  4. Which type of cleanroom blows clean air from parts of the ceiling and maintains cleanliness by mixing with and diluting the room air? Its cleanliness is lower than with unidirectional flow, but its equipment cost is lower.
  5. Which filter is used to remove airborne molecular contamination (AMC) such as ammonia and organics from cleanroom air?