It is inevitable that we are exposed to radiation daily from various sources and products that we consume on daily basis. The use of toothpaste for oral hygiene is one of the most common daily practices by humans and yet very little data are available regarding its radiation content. In this work, we investigated the concentrations of gamma emitting radionuclides in toothpaste samples consumed in Jordan. 40K and 226Ra were detected in almost one-third of the samples, whereas 228Ra was detected in nearly half of them. The corresponding activity concentrations in the detected samples were in the ranges of 68.7–154.2, 4.6–14.1 and 1.3–10.0 Bq/kg, respectively. Dose assessment of accidental ingestion of toothpaste for children and adults was made, and its contribution to the annual effective dose was found to be very minimal with maximum doses of ~2.9 and 1.3 μSv for children and adults, respectively.

中文翻译：

---

牙膏样品中释放伽马放射性核素活度浓度的测量和相应年有效剂量的评估

不可避免地，我们每天都会受到来自我们日常消费的各种来源和产品的辐射。使用牙膏进行口腔卫生是人类最常见的日常行为之一，但关于其辐射含量的数据却很少。在这项工作中，我们调查了约旦消费的牙膏样品中释放伽马射线的放射性核素的浓度。在近三分之一的样本中检测到 40K 和 226Ra，而在近一半的样本中检测到 228Ra。检测到的样品中相应的活性浓度分别在 68.7-154.2、4.6-14.1 和 1.3-10.0 Bq/kg 的范围内。对儿童和成人误食牙膏进行了剂量评估，发现其对年有效剂量的贡献非常小，最大剂量约为 2。