Table 1 Formulas for calculating radiological protection factors.

From: Heavy metals and natural radioactive isotopes in phosphate and compound fertilisers and their impact on human health

Indicator/parameter

Formula

Numbering

Bibliography

Radium equivalent activity

\(\:{Ra}_{eq}={A}_{Ra}+{1.43A}_{Th}+{0.077A}_{K}\)

(1)

36

Outdoor external dose

\(\:{D}_{out}=0.462{A}_{Ra}+0.604{A}_{Th}+0.0417{A}_{K}\)

(2)

37

Indoor external dose

\(\:{D}_{in}=0.92{A}_{Ra}+1.1{A}_{Th}+0.080{A}_{K}\)

(3)

38

Annual effective dose equivalent outdoors

\(\:{E}_{out}={D}_{out}\cdot\:8766\cdot\:0.8\cdot\:0.7\cdot\:{10}^{-6}\)

(4)

37

Annual effective dose equivalent indoors

\(\:{E}_{in}={D}_{in}\cdot\:8766\cdot\:0.2\cdot\:0.7\cdot\:{10}^{-6}\)

(5)

37

Total annual effective dose equivalent

\(\:{E}_{tot}={E}_{out}+{E}_{in}\)

(6)

37

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