... 7 65 for experimental purposes, 762 fired and heated vessels, 762 pipeline examination, 7 95 6 piping, 762 Pressure Equipment Directive, 760 record keeping, 7 65 6 regulations for safe use, 763 6, 794 6 rigid ... 57 3–4thermal environment measurement, 57 2–3time weighted average (TWA), 56 9 time weighted average (TWA)values, 57 4units and recommendations, 57 4ventilation control, 57 5–7ventilation performance ... meters, 53 1–3control principles, 479dose limits, 478–9, 53 3 5 dose rate meters, 53 2dose-response relationship,898–9effective dose, 52 8effects of, 477electric and magnetic fields, 53 9–41environmental...