r. s. omar, h. a. a. halim, r. tukimin, n.m. ibrahim, n. m. hidzir, s. m. fadzil, w. s. w. yunoh, n. a. zainal, m. s. a. samah, a. s. kamalludin..  (2025).  assessment of radiofrequency electromagnetic field (rf-emf) exposure from 5g infrastructure at universiti kebangsaan malaysia.  - 2nd multidisciplinary regional conference in science and technology (mrcst 2025).  . 

r. s. omar, h. a. a. halim, r. tukimin, w. s. w. yunoh, n. m. hidzir, s. m. fadzil, f. mohamed, n. m. ibrahim, n. a. zainal, m. s. a. samah, a. s. kamalludin.  (2025).  environmental monitoring of rf-emf radiation at universiti kebangsaan malaysia: a safety assessment for public exposure and assurance.  - international nuclear science, technology and engineering conference 2025 (inustec2025).  . 

r. s. omar, p. n. a. m. za’bah, r. tukiminb, w. s. w. yunoh, n. m. ibrahim, n. a. zainal, m. s. a. samah, a. s. kamalludin..  (2025).  non-ionising radiation from consumer electronic products: exposure and safety assessment.  - national physics conference (perfik 2025).  . 

r. s. omar, s.n. p. naidu, s. r. parthasarathy, r. tukimin, w. s. w. yunoh, n. m. ibrahim, n. a. zainal, m. s. a. samah, a. s. kamalludin..  (2025).  occupational risk assessment and safety measures for uv and laser radiation exposure.  - the national physics conference (perfik 2025).  . 

ratna suffhiyanni omar, n. a. s. muhd tarmizi.  (2024).  evaluating ct dose index: a comparative study of multi-detector ct scanners.  - physical and integrated sciences conference 2024 .  . 

ratna suffhiyanni omar, s. hashim, d.a. bradley, n. d. shariff.  (2024).  optimizing ct dose accuracy and patient safety: a comparative evaluation across five scanner models in malaysian hospitals.  - 11th international conference on high level environmental radiation areas (ichlera-11).  . 

r.s. omar, m.n. mazlan, n.f. ismail , f. mohamed, u. techanamurthy.  (2024).  assessment of thyroid counter accuracy using caesium-137 and europium-152 radionuclides.  - 11th international conference on high level environmental radiation areas (ichlera-11).  . 

r.s. omar, m.n. mazlan, n.f. ismail a,.  (2024).  performance assessment of thyroid counter using gamma emitting radionuclides caesium (cs-137) and europium (eu-152).  - physical and integrated sciences conference 2024 .  . 

ratna suffhiyanni omar.  (2024).  keselamatan dan teknik dosimetri dalam pengimbas tomografi berkomputer.  - seminar fizik bil. 9/2024.  .