Noise Vibration Radiation And Impact Exposure Control

Noise, Vibration, Radiation, and Impact Exposure Control

Recognizing nonchemical exposures

Construction sites create health exposures through energy as well as through dust or chemicals. Noise damages hearing, hand-arm vibration can contribute to vascular and nerve disorders, whole-body vibration can aggravate back and joint conditions, radiation can injure tissue or increase cancer risk, and impact exposure can damage eyes, face, hands, joints, and the body. These hazards are easy to underestimate because the work may look routine.

Common high-noise tasks include pile driving, concrete chipping, powder-actuated tools, saw cutting, demolition, pneumatic tools, compressors, generators, earthmoving equipment, and work in reverberant spaces. Vibration is associated with breakers, grinders, compactors, rivet busters, rotary hammers, chain saws, powered tampers, and mobile equipment.

Radiation sources may include welding arcs, lasers, ultraviolet curing systems, nuclear density gauges, radiography, radioactive level or thickness gauges, and naturally occurring or technologically enhanced radioactive material at some sites. Impact hazards include flying chips, ricochet, tool kickback, dropped material, compressed-air failures, and repeated striking or kneeling tasks.

Noise control and hearing conservation

Noise control starts with identifying who is exposed, how loud the source is, and how long exposure lasts. A sound level meter can identify loud areas and tasks, but personal noise dosimetry is usually needed to evaluate full-shift worker exposure. Hearing conservation requirements can be triggered when exposures reach action levels, and controls should not be limited to earplugs.

Effective controls include buying quieter equipment, maintaining mufflers and bearings, using acoustic blankets or barriers, enclosing noisy generators, increasing distance, scheduling noisy work when fewer workers are nearby, limiting time, and reducing reflected noise in enclosed areas. Hearing protectors must be selected, fitted, and used correctly. Dual protection may be needed for very high noise. A common field failure is assigning earplugs without checking whether workers can insert them, communicate safely, or maintain situational awareness.

Vibration and impact controls

Vibration control is partly equipment selection and partly work design. Use lower-vibration tools, sharp bits, proper handles, vibration-damped accessories, preventive maintenance, and task rotation. Keep hands warm and dry in cold conditions, because cold can worsen circulation problems. Anti-vibration gloves may help in limited cases, but they do not eliminate exposure and may reduce grip or dexterity. For mobile equipment, maintain seats, tires, tracks, haul roads, and suspension systems to reduce whole-body vibration.

Impact controls begin with keeping energy contained. Guards, deflectors, tool rests, face shields, safety glasses with side protection, screens, barricades, exclusion zones, and proper line-of-fire planning reduce the chance that debris or force reaches a worker. Repeated impact to knees, shoulders, wrists, or hands should also be treated as an ergonomic exposure, not only as an acute injury issue.

Radiation field control

Radiation work requires source-specific competence. Lasers need class recognition, controlled access, beam path control, warning signs, eyewear where required, and avoidance of reflective surfaces. Welding arcs require shade selection, screens, skin coverage, and control of reflected ultraviolet exposure to nearby workers. Nuclear gauges and radiography require qualified operators, storage controls, restricted areas, survey instruments, dosimetry when required, emergency procedures, and immediate reporting of lost, damaged, or uncontrolled sources.

The classic radiation controls are time, distance, and shielding. Reduce time near the source, increase distance, and use shielding appropriate to the radiation type. A CHST should not improvise radiation controls. If the source, dose rate, access boundary, or regulatory requirement is unclear, escalate to the radiation safety officer, qualified operator, owner representative, or industrial hygienist.

Documentation and escalation

Document noise surveys, dosimetry results, equipment substitutions, barriers, hearing protector selection, training, audiometric referrals, radiation permits, laser classifications, gauge logs, and incident reports. Escalate when workers report ringing ears, temporary hearing changes, numbness, tingling, white fingers, burns, eye pain after arc exposure, suspected radiation source damage, uncontrolled laser paths, or repeated impact injuries. These signs indicate that exposure is no longer theoretical and needs competent review.