Comparison of Natural Radioactivity of Commonly Used Fertilizer Materials in Egypt and Japan

Table 7

Comparison of radiological indexes in the present work and their values in literature.

Country	Sample	Radium equivalent (Bq/kg)	Gamma index ()	References
Egypt	Fertilizer			Present work
Japan	Fertilizer			Present work
Algeria	NPK fertilizer	1168	9.6	[3]
Brazil	NPK fertilizer	1772	12.3	[11]
Saudi Arabia	NPK fertilizer	275	—	[12]
Egypt (Qena)	Phosphate fertilizer	462	3.1	[13]
Bangladesh	Triple superphosphate	374	—	[14]