Table 2

Phosphogypsum raw material				Calcium carbonate produced
Nuclide	Value(Bq/kg)	Unc.	MDA	Nuclide	Value (Bq/kg)	Unc.	MDA
²³⁸ U	14.71	0.51	0.59	²³⁸ U	8.65	0.43	0.60
²³⁴U	14.81	0.51	0.60	²³⁴U	8.72	0.43	0.61
²²⁶ R a	316	32	90	²²⁶ R a	413	37	99
²¹⁰Pb	171	20	48	²¹⁰Pb	237	24	51
²³⁵U	0.68	0.03	0.03	²³⁵U	0.40	0.02	0.03
²²⁸ R a	424	18	33	²²⁸ R a	442	20	42
²²⁸Th	114	6	8.81	²²⁸Th	123	6	11
⁴⁰k	< MDA	-----	140	⁴⁰k	< MDA		160

The uncertainty (Unc. column) is quoted at 1 sigma (or coverage factor k = 1). The uncertainty is calculated mainly from counting statistics and it is not the standard deviation obtained from replicate measurements. No uncertainty value is reported of a less than MDA (“< MDA”) is indicated in the Value column. The minimum detectable activity concentration (MDA column) is calculated with a 95% confidence level.

Table 2: Analysis of Foskor phosphogypsum and produced calcium carbonate for selected radionuclide (Bq/kg).