Uranium, thorium and potassium are the main terrestrial sources of radiation that are located at different levels in the soil depending on the geographical and geological conditions and contribute to increase of the natural radiation levels of the regions. In addition to the natural radiation sources, Cesium-137 which can spread from nuclear tests and accidents such as Chernobyl Nuclear Power Plant Accident is also an important artificial radiation source of that contributes to the increase of radioactivity in the soil. Determination of both natural and artificial radioactivity levels of soil is important in terms of assessing people's possible exposure to the internal radiation and ensuring that people can be protected from the harmful effects of the external radiation. In this study, on the 30th anniversary of the Chernobyl Nuclear Power Plant Accident, soil samples were collected from Rize province which was affected by the Chernobyl Nuclear Power Plant Accident in 1986 and the activity concentrations of natural and artificial radionuclides were measured and radiological hazard parameters were calculated. Radioactivity measurements were caried out with gamma spectrometry system with a high purity germanium detector. The activity concentrations were measured in range of 4.45 ± 0.39 to 32.19 ± 0.78 Bq kg⁻¹ with an average of 17.68 ± 0.68 Bq kg⁻¹ for ²²⁶Ra, 5.58 ± 0.65 to 43.61 ± 1.67 Bq kg⁻¹ with an average of 22.53 ± 1.26 Bq kg⁻¹ for ²³²Th, 28.82 ± 1.37 to 773.19 ± 12.14 Bq kg⁻¹ with an average of 277.14 ± 6.24 Bq kg⁻¹ for ⁴⁰K and 1.99 ± 0.17 to 376.85 ± 2.52 Bq kg⁻¹ with an average of 110.11 ± 0.98 Bq kg⁻¹. The average activity concentrations of ²²⁶Ra, ²³²Th and ⁴⁰K were found below the world median activity concentrations of 35, 30 and 400 Bq kg⁻¹, respectively. Despite the high ¹³⁷Cs activity concentrations were determined in present study compared to similar works being done in Turkey and other countries, the average activity concentration of ¹³⁷Cs in investigated samples was significantly found lower than the ¹³⁷Cs values in soil samples from Rize in 1990 carried out by TAEA. In present study, the average radium equivalent activity (Ra_eq), external hazard index (H_ex) and internal hazard index (H_in) values were below the recommended limits by UNSCEAR. The average absorbed dose rate in air (D) and annual effective dose equivalent (AEDE) values were found lower than the world median values. The calculated excess lifetime cancer risk (ELCR) values for soil samples were obtained less than the precautionary limit of 0.29 × 10⁻³.

铀、钍和钾是主要的陆地辐射源，根据地理和地质条件位于土壤中的不同水平，有助于提高该地区的自然辐射水平。除了天然辐射源外，可从核试验和切尔诺贝利核电站事故等事故中传播的铯137也是一种重要的人工辐射源，有助于增加土壤中的放射性。确定土壤的天然和人工放射性水平对于评估人们可能受到内部辐射的影响并确保人们可以免受外部辐射的有害影响非常重要。在这项研究中，在切尔诺贝利核电站事故30周年之际，从1986年受切尔诺贝利核电站事故影响的里泽省采集土壤样品，测定了天然和人工放射性核素的活度浓度，计算了放射性危害参数。放射性测量是用带有高纯度锗探测器的伽马能谱系统进行的。活性浓度测量范围为 4.45 ± 0.39 至 32.19 ± 0.78 Bq kg 放射性测量是用带有高纯度锗探测器的伽马能谱系统进行的。活性浓度测量范围为 4.45 ± 0.39 至 32.19 ± 0.78 Bq kg 放射性测量是用带有高纯度锗探测器的伽马能谱系统进行的。活性浓度测量范围为 4.45 ± 0.39 至 32.19 ± 0.78 Bq kg^-1，平均17.68±0.68贝千克^-1为²²⁶镭，5.58±0.65至43.61±1.67公斤贝^-1，平均22.53±1.26贝千克^-1为²³² Th时，28.82±1.37到773.19±12.14 BQ千克^-1，平均277.14±6.24 BQ千克^-1为^{4 0} K和1.99±0.17到376.85±2.52公斤BQ ^-1，平均110.11±0.98 BQ千克^-1。发现²²⁶ Ra、²³² Th 和^{4 0} K 的平均活动浓度低于 35、30 和 400 Bq kg ^-1的世界中值活动浓度， 分别。尽管与在土耳其和其他国家进行的类似工作相比，本研究中确定的¹³⁷ Cs 活性浓度较高，但发现调查样品中¹³⁷ Cs的平均活性浓度显着低于1990 年来自 Rize 的土壤样品中的¹³⁷ Cs 值由 TAEA 执行。在本研究中，平均镭当量活度（Ra _eq）、外部危害指数（H _ex）和内部危害指数（H _in) 值低于 UNSCEAR 推荐的限值。空气中的平均吸收剂量率 (D) 和年有效剂量当量 (AEDE) 值低于世界中值。计算出的土壤样品的超额终生癌症风险 (ELCR) 值低于预防限值 0.29 × 10 ^-3。