Worker Protection and Safety
Core Concepts
Worker protection is built on engineering controls first, then PPE. Engineering controls include negative-pressure enclosures, HEPA ventilation, and wet methods. PPE includes respirators, protective clothing, and eye protection. Candidates must know respirator types: half-mask air-purifying (with HEPA/P100 filters), full-face air-purifying, powered air-purifying respirator (PAPR), and supplied-air (Type C) for the highest exposures. Understand fit testing (qualitative and quantitative), medical evaluation, and the requirement that respirators be worn in the regulated area.
Know personal exposure monitoring and how results drive respirator selection and work practices. Understand that protective clothing is disposable coveralls removed in the decon sequence, and that street clothes must not be worn out of the work area. Recognize the importance of hygiene facilities (no eating, drinking, or smoking in the work area) and medical surveillance for covered workers.
Traps
Common traps: assuming a dust mask is adequate-it is not; HEPA respiratory protection is required. Another: thinking fit testing is optional-it is required before use and annually. Questions may suggest reusing disposable coveralls or leaving the work area in contaminated clothing-both wrong. Watch for confusion between air-purifying and supplied-air respirators: supplied-air is used when air-purifying is inadequate (e.g., high concentrations, oxygen-deficient atmospheres). Also, do not confuse exposure monitoring with clearance sampling.
Worked Example / Rule of Thumb
Rule of thumb: Engineering controls before PPE, and never compromise the seal. If a question offers a cheap shortcut (dust mask, skipping fit test, reusing coveralls), it is the wrong answer.
Key Points
- Engineering controls precede PPE in the hierarchy.
- HEPA respirators are required; dust masks are not acceptable.
- Fit testing and medical evaluation are mandatory.
- Supplied-air respirators are used when air-purifying units are inadequate.
- Disposable coveralls are removed in decon; no street clothes out of the area.