Table 4 Activity concentrations (Bq/l) of HFO samples.

From: Analytical Study of Fuel Switching from Heavy Fuel Oil to Natural Gas in clay brick factories at Arab Abu Saed, Greater Cairo

Sample Bq/l
Ra-226 Th-232 K-40
S1 1.0 1.0 2.5
S2 1.9 1.4 1.0
S3 1.7 1.2 1.0
S4 1.0 1.7 1.9
S5 1.5 1.2 1.8
S6 1.4 1.5 1.5
Average 1.4 ± 0.4 1.3 ± 0.2 1.6 ± 0.6
Range 1–1.9 1–1.7 1–2.5
Daily concentration (Bq/day) 7000 6500 8000