THE USE OF WASTE ROCK FOR ROADS AND BUILDINGS AS AN ...

Mine Site Exposure Scenarios
• Crusher/Screen Operators and FEL Driver (2000 h/a)
– Assumed to be exposed to external gamma radiation from an infinite slab of
waste rock at average distances of 1 m and 2 m respectively.
– Also assumed to inhale dust generated through the loading, crushing and
screening operations at an average gravimetric dust load of 1 mg/m 3 (double
the inhalable concentration assumed by the NEA for road construction
operations but similar to the value assumed by the IAEA for slag workers).
• Waste Rock Transporter (1000 h/a because one way only)
– Transport of the waste rock to the clients included as an on-site activity.
– Transporter assumed to be situated 2 metres away from a 20 tonne load of
waste rock simulated as a half cylinder with a radius of 0.8 metre and length of
about 10 metres (similar to the scenario assumed by the IAEA for truck drivers
transporting scrap).
– Transporter only be exposed to dust during loading and unloading operations
(less than 10 % of working period), which is similar to continuous exposure to a
gravimetric dust load of 100 μg/m 3 .