Natural radioactivity level in graphite samples from the Cătălinul deposit, Parâng Mountains, Romania: sources identification and radiological risk assessment

Review of the Bulgarian Geological Society Pub Date : 2023-12-01 DOI:10.52215/rev.bgs.2023.84.3.245

Adriana Ion, Ana Cosac, Vlad-Victor Ene

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Abstract

Twenty graphite samples (amorphous and crystalline flake types of graphite) were collected from the ore storage of the Catalinul deposit and, the 238U, 232Th, 40K naturally occurring radionuclides have been investigated by gamma-ray spectrometry. The mineral contents of selected graphite samples were examined using a scanning electron microscope (SEM). The radiological hazard parameters: radium equivalent activity (Raeq), absorbed gamma dose rates in air (DR), and external hazard index (Hex) were calculated and compared with international safety limits. Radiometric data showed average specific activities for 238U, 232Th and, 40K of 80.40, 49.69 and, 124.21 Bq kg–1 for amorphous graphite respectively, 38.53, 76.25 and, 241.12 Bq kg–1 for flake graphite. Zircon, rutile, uraninite, coffinite, urano-thorite, and monazite are the main radioactive element bearing minerals. The mean of the radiological hazard parameters: Raeq – 262.22 (Bq kg–1), DR – 123.72 (nGy/h), and 0.7 – Hex do not exceed the recommended values by UNSCEAR.

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罗马尼亚 Parâng 山 Cătălinul 矿床石墨样品中的天然放射性水平：来源识别和辐射风险评估

从 Catalinul 矿床的矿石储藏中采集了 20 个石墨样品（无定形和结晶片状石墨），并通过伽马射线光谱仪对其中的 238U、232Th 和 40K 天然放射性核素进行了研究。使用扫描电子显微镜（SEM）对所选石墨样品的矿物含量进行了检测。计算了放射性危害参数：镭当量活度（Raeq）、空气中吸收伽马剂量率（DR）和外部危害指数（Hex），并与国际安全限值进行了比较。辐射测量数据显示，无定形石墨中 238U、232Th 和 40K 的平均比活度分别为 80.40、49.69 和 124.21 Bq kg-1，鳞片石墨中分别为 38.53、76.25 和 241.12 Bq kg-1。锆石、金红石、铀矿石、咖啡石、铀钍石和独居石是含放射性元素的主要矿物。放射性危害参数的平均值为Raeq - 262.22 (Bq kg-1)、DR - 123.72 (nGy/h) 和 0.7 - Hex 均未超过联合国辐射科委的建议值。

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Review of the Bulgarian Geological Society

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