In this work we critically assess the soil-to-plant transfer factors (TF) for ¹³⁷Cs and ⁴⁰K in edible fleshy organs of tropical plants that are often components of the human diet. Radionuclide concentrations in soil and plants were obtained from previous investigations developed in Brazil, after the Goiânia radiological accident occurred in 1987. Transfer factors were determined in specific plant compartments (main root, main stem, bark, old and new branches, twig, old and new leaves, mature and green edible organs) of tropical species such as lemon (Citrus aurantifolia), orange (Citrus sinensis), guava (Psidium guajava), chili pepper (Capsicum frutescens), pomegranate (Punica granatum), papaya (Carica papaya), banana (Musa paradisíaca), and manioc (Manihot esculenta). For ¹³⁷Cs, soil-to-fruit transfer factor ranged from 0.80 × 10⁻² (banana) to 3.65 × 10⁻¹ (pomegranate); for ⁴⁰K, this factor was from 4.42 × 10⁻¹ (orange) to 1.74 (chili pepper). Considering all the plant compartments analysed, the transfer factors for ⁴⁰K are between 24.5 (guava) and 90.5 (papaya) times higher than for ¹³⁷Cs. For both radionuclides, considerable differences in soil-to-plant transfer were found when new growing parts of the plant (green edible organ, leaf, and twig) are considered with respect to those older parts (mature edible organ, old leaf and branches). Considering all the species analyzed, the relationship TF(⁴⁰K)/TF(¹³⁷Cs) does not seem to follow a characteristic pattern. However, if we compare the value of this relationship for two organs of the same plant, the result is approximately constant, regardless of the species considered. This confirms earlier evidence that both radionuclides are similarly distributed in the different organs of the studied species.

The differences in the transfer factors according to the ripening status of edible organs must be particularly considered when estimating the dose from ingestion of fruits and their derivatives in dose assessment models.

^{在这项工作中，我们批判性地评估了热带植物可食用肉质器官中137} Cs 和⁴⁰ K的土壤到植物转移因子 ( TF )，这些肉质器官通常是人类饮食的组成部分。土壤和植物中的放射性核素浓度是在 1987 年戈亚尼亚放射性事故发生后，在巴西开展的先前调查中获得的。转移因子是在特定植物区室（主根、主茎、树皮、新旧枝条、树枝、旧枝和新枝）中确定的。柠檬（ Citrus aurantifolia）、橙（Citrus sinensis）、番石榴（Psidium guajava）、辣椒（Capsicum frutescens）等热带物种的新叶、成熟和绿色的可食用器官）)、石榴 ( Punica granatum )、木瓜 ( Carica papaya )、香蕉 ( Musa paradisíaca ) 和木薯 ( Manihot esculenta )。对于¹³⁷ Cs，土壤到果实的转移因子范围为 0.80 × 10 ^-2（香蕉）到 3.65 × 10 ^-1（石榴）；对于⁴⁰ K，该因子为 4.42 × 10 ^-1（橙色）到 1.74（辣椒）。^{考虑到分析的所有植物区室， 40} K的传递因子比^{137高 24.5（番石榴）和 90.5（木瓜）倍}CS。对于这两种放射性核素，当考虑植物的新生长部分（绿色可食用器官、叶子和树枝）相对于那些较老的部分（成熟的可食用器官、老叶和树枝）时，发现土壤到植物的转移存在相当大的差异. 考虑到所有分析的物种，TF ( ⁴⁰ K)/ TF ( ¹³⁷ Cs) 的关系似乎并不遵循特征模式。但是，如果我们比较同一植物的两个器官的这种关系的值，则结果几乎是恒定的，而与所考虑的物种无关。这证实了较早的证据，即两种放射性核素在所研究物种的不同器官中分布相似。

在剂量评估模型中估计摄入水果及其衍生物的剂量时，必须特别考虑根据可食用器官成熟状态的传递因子的差异。