en Radiation Biology Radiation Biology تحقيق بديع Original Research <div style="text-align: justify;">Background: The new glasses from harmful environmental waste such as cement dust; limestone phosphate, sand and borax (Genkare) were manufactured. Investigation of the radioactivity present in these materials (Phosphate rock, cement dust, limestone, sand and borax) enables one to assess any possible radiological hazard to humankind by such materials. Materials and Methods: Fifteen samples were collected from five locations. Activity measurements have been performed by gamma-ray spectrometer, employing a high-resolution scintillation detector NaI (Tl) crystal 3 &times;3 inch. In addition, the radiological hazards were calculated for the investigated samples. Results: The average values of activity ranged from 28&plusmn;2 to 163&plusmn;12, 2.8&plusmn;0.7 to 40&plusmn;3 and from 49&plusmn;4 to 1337&plusmn;74 Bq kg-1 for ²²⁶R, ²³²Th and ⁴⁰K, respectively. The values of absorbed dose rates, radium equivalent activities and annual effective dose due to 226Ra, 232Th and 40K respectively, are ranged from 22.05 to 101.59 nGy h-1, 45.90 to 224.22 Bq kg^-1and 27.04 to 124.59 &micro;Sv y-1. In addition, the values of external hazard index, internal hazard index and gamma index have been calculated. &nbsp;Conclusion: According to the obtained results, all materials would not present a significant radiological hazard except phosphate. The results of the study could serve as important baseline radiometric data for future epidemiological studies and monitoring initiatives.<br> &nbsp;</div> Natural radioactivity, glass ceramics radiological hazards, phosphate rock, cement dust, limestone, sand, borax and glasses. 207 215 http://ijrr.com/browse.php?a_code=A-10-1-718&slc_lang=en&sid=1 R. Elsaman reda_m8282@yahoo.com 7900319475328460011427 7900319475328460011427 Yes Physics Department, Faculty of Science, Al–Azhar University, Assiut 71524, Egypt G. A. M. Ali 7900319475328460011428 7900319475328460011428 No Chemistry Department, Faculty of Science, Al–Azhar University, Assiut, 71524, Egypt M. A. M. Uosif 7900319475328460011429 7900319475328460011429 No Physics Department, Faculty of Science, Al–Azhar University, Assiut 71524, Egypt K. H. S. Shaaban 7900319475328460011430 7900319475328460011430 No Chemistry Department, Faculty of Science, Al–Azhar University, Assiut, 71524, Egypt Y. B. Saddeek 7900319475328460011431 7900319475328460011431 No Physics Department, Faculty of Science, Al–Azhar University, Assiut 71524, Egypt K. A. Aly 7900319475328460011432 7900319475328460011432 No Physics Department, Faculty of Science, Al–Azhar University, Assiut 71524, Egypt K. F. Chong 7900319475328460011433 7900319475328460011433 No Faculty of Industrial Sciences and Technology, University Malaysia Pahang, Gambang, 26300 Kuantan, Malaysia