Abstract

This study determined the activity concentrations and corresponding transfer factors (TF) of ⁴⁰K, ²²⁶Ra, and ²³²Th in three tobacco components (root, stem, and leaf). The radiation hazard index parameters were assessed for the tobacco leaf. The activity concentrations in the soil were 589–762, 32–43, and 49–59 Bq kg-dw⁻¹ (dry weight) for ⁴⁰K, ²²⁶Ra, and ²³²Th, respectively. The average activity concentrations of ⁴⁰K, ²²⁶Ra, and ²³²Th were 447, 5.41 and 5.69 Bq/kg-dw for the root, 670, 9.64 and 7.61 Bq kg-dw⁻¹ for the stem, and 793, 6.79 and 6.15 Bq kg-dw⁻¹ for the leaf, respectively. The TF values were 0.42–1.42, 0.10–0.49 and 0.06–0.23 for ⁴⁰K, ²²⁶Ra, and ²³²Th, respectively. The stem and leaf ⁴⁰K TF values were significantly higher than the root values. The stem ²²⁶Ra TF values were significantly higher than the root values. The ²²⁶Ra and ²³²Th activity concentrations and TFs of tobacco components had a significant positive correlation. Based on the activity concentrations of the tobacco leaves, the annual inhalation effective dose to the lungs for an adult smoker was 0.32–0.81 mSv y⁻¹ (average 0.60 mSv y⁻¹). The Excess Lifetime Cancer Risk (ELCR) caused by smoking was an average of 2.39 × 10⁻³.

 抽象的

本研究测定了三种烟草成分（根、茎和叶）中⁴⁰ K、 ²²⁶ Ra 和²³² Th 的活性浓度和相应的转移因子 (TF)。评估了烟叶的辐射危害指数参数。 ⁴⁰ K、 ²²⁶ Ra 和²³² Th 下土壤中的活性浓度分别为 589-762、32-43 和 49-59 Bq kg-dw ^-1 （干重）。根的⁴⁰ K、 ²²⁶ Ra和²³² Th的平均活性浓度分别为447、5.41和5.69 Bq/kg-dw，茎的平均活性浓度为670、9.64和7.61 Bq kg-dw ^-1 ，以及793、6.79和6.15。叶子分别为 Bq kg-dw ^-1 。 ⁴⁰ K、 ²²⁶ Ra 和²³² Th 的 TF 值分别为 0.42–1.42、0.10–0.49 和 0.06–0.23。茎和叶⁴⁰ K TF值显着高于根值。茎²²⁶ Ra TF值显着高于根值。烟草成分的²²⁶ Ra 和²³² Th 活性浓度与 TF 呈显着正相关。根据烟叶的活性浓度，成年吸烟者肺部年吸入有效剂量为0.32-0.81 mSv y ^-1 （平均0.60 mSv y ^-1 ）。吸烟导致的终生超额癌症风险（ELCR）平均为2.39 × 10 ^-3 。