Natural radiation of chemical fertilisers and radiological impact on agriculture soil

To investigate the radiological hazards indices of chemical fertilisers commonly used in agriculture soils of Arasbaran, Iran, the activity concentration of $^{226}$Ra, $^{232}$Th, and $^{40}$K in four types of chemical fertilisers were measured by gamma spectrometry system. The concentration range for $^{226}$Ra, $^{232}$Th, and $^{40}$K was obtained from 54 ± 2.2 to 1585 ± 29.4, 6 ± 0.1 to 157 ± 9.1, and 31 ± 1.5 to 1496 ± 32.8 Bq/kg, respectively. The obtained results showed that the fertiliser's average radiation hazard parameters were higher than the reference level. The outcomes give rise to more parameter values over the permissible limit, increasing the likelihood of adverse health consequences.