Preparation and Performance of Vanadium Tailings-Reservoir Sediment-Phosphogypsum-Based Foamed Concrete

Table 5

Radioactive test results of FC mixture.

Sample	Specific activity of radionuclides (Bq·kg^−1)			Internal exposure index	External exposure index	Test results
FC mixture	^226Ra	^232Th	^40K	0.0	0.1	Qualified
	6.2	8.9	146.3
Note	Internal exposure index = CRa/370 + CTh/260 + CK/4200; external exposure index = CRa/200; uncertainty of measurement results (1σ) ≤ 20%