en Radiobiology Radiobiology تحقيق بديع Original Research <div style="text-align: justify;">Background: This study aimed to investigate the radiation hazard indices from sand samples of&nbsp; Ma&rsquo;rib Governorate in Yemen, where the majority of oil and gas facilities are installed. Methods and Materials: Thirty five samples of desert sand from Ma&rsquo;rib Governorate in Yemen were collected and tested their radiation hazard indices by using High Purity Germanium (HPGe) detector. Results: Based on the measurement of the concentrations of ²²⁶Ra, ²³²Th, and ⁴⁰K, the radium equivalent activity (Ra_eq), the activity concentration index (I_&gamma;), the external hazard index (H_ex) and the internal hazard index (H_in) were all calculated.&nbsp; Also, the absorbed dose rate in Air (ADR) and the annual effective dose (AED) are calculated. Conclusions: Comparing the practically attained results with internationally permissible values, it was found that most of the radiological parameters, including the radiation hazard indices of the studied samples, fall within the world&#39;s permissible limits and don&#39;t expose risks to the human beings and environments.</div> Natural radioactivity, sand samples, HPGe detector, annual effective dose. 615 623 http://ijrr.com/browse.php?a_code=A-10-2188-36&slc_lang=en&sid=1 M.M.M. Ali 7900319475328460020263 7900319475328460020263 No Collage of Nuclear Science and Technology, Harbin Engineering University, Harbin 150001, China H. Zhao mohsenzmra7777@gmail.com 7900319475328460020264 7900319475328460020264 Yes Collage of Nuclear Science and Technology, Harbin Engineering University, Harbin 150001, China A. Rawashdeh 7900319475328460020265 7900319475328460020265 No Collage of Nuclear Science and Technology, Harbin Engineering University, Harbin 150001, China Y.A. Mohammed 7900319475328460020266 7900319475328460020266 No College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin, China, 150001 M. Al Hassan 7900319475328460020267 7900319475328460020267 No College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin, China, 150001