Abstract

Wadi El Reddah has radiation exposure due to the presence of different types of complexed rocks along with a huge sector of Hammamat sedimentary rocks, monzongranites of Gabal El Reddah, perthitic leucogranites of Gabal Gattar, as well as swarms of post-granitic dykes. The studied sediments show wide variation in their uranium, thorium, radium (eU), and potassium (K, %) contents. The U content ranges from 5 to 51 ppm with an average of 17.33 ppm; the Th content, from 16 to 141 pp with an average of 32.47 ppm. Ra (eU) varies from 5 to 26 ppm with an average of 9.56 ppm, and the potassium content ranges from 2.19 to 4.41% with an average of 3.19%. The absorbed dose rate (D), annual effective dose equivalent (AEDE), radium equivalent activity (Ra_eq), external (H_ex) and internal (H_in) hazard indices, and the activity gamma index (I_γ) caused by gamma-emitting natural radionuclides were determined from the obtained values of the ²³⁸U, ²³²Th, and ⁴⁰K content. Most of the studied samples were out of range with respect to the universal standards.

中文翻译：

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Wadi El Reddah流沉积物中自然放射性的调查及其放射学意义

摘要

瓦迪埃尔雷达（Wadi El Reddah）具有多种类型的复杂岩石，大量的哈马马特（Hammamat）沉积岩，加巴尔艾尔雷达（Gabal El Reddah）的长宗花岗岩，加巴尔加塔尔（Gabal Gattar）的蠕虫性白云岩以及大量的后花岗岩堤。研究的沉积物的铀，th，镭（eU）和钾（K，％）含量差异很大。U含量为5至51ppm，平均为17.33ppm。Th含量从16到141 pp，平均32.47 ppm。Ra（eU）在5至26 ppm之间变化，平均为9.56 ppm，钾含量在2.19至4.41％之间，平均为3.19％。吸收剂量率（D），年有效剂量当量（AEDE），镭当量活性（Ra _eq），外部剂量（H_前）和内部（ħ_中）危险指数，和活性伽马指数（我_γ）引起的发射γ射线的天然放射性核素从所得到的值来确定²³⁸ U，²³² Th和⁴⁰ K含量。就通用标准而言，大多数研究样品超出了范围。