Builds a lifetime cumulative asbestos dose from individual activities. For each activity enter the activity (free text, or pick from the autocomplete catalogue), hrs/wk, wks/yr (default 48), years, and the concentration in f/ml — auto-filled from the catalogue with a representative figure from the source's published range; override with your own or expert figure where the evidence puts your case elsewhere.

Partial dose = concentration × (hrs/wk × wks/yr × years) ÷ 1,920, reported in f/ml·years — one "year" being 1,920 working hours (the occupational convention). Example: stripping lagging 40 h/wk × 48 wk/yr × 2 yrs @ 10 f/ml = 20 f/ml·yr.

Catalogue sources: EH35 (HSE Guidance Note, October 1984) — construction processes: stripping, asbestos cement, insulation board. Harries 1971 (Ann. Occup. Hyg. 14, 241–254) — Naval-dockyard processes: sprayed-asbestos removal, pipe/machinery lagging, calcium silicate, cloth and rope, acoustic insulation.