iylia maisarah zaini, norsyahidah mohd hidzir, ratna suffhiyanni omar, syazwani mohd fadzil, mohd idzat idris.  (2025).  kesan kitosan tersinar sebagai salutan luaran buah nanas.  - sains malaysiana.  2277 - 2285. 

r. s. omar, n. i. e. m. nor, w. s.w. yunoh, n.m. hidzir, f. k. mohamed, n. a. zainal , m. s. a. samah, r. tukimin.  (2025).  environmental monitoring of rf-emf radiation at the malaysian nuclear agency: safety, exposure, and public assurance.  - the international conference and workshop of basic and applied sciences 2025 (icowobas2025).  . 

r. s. omar, n. a. s. m. tarmizi , n. a. zashidi , f. k. mohamed.  (2025).  dosimetric evaluation of multi-detector ct scanners using pmma phantoms for head and abdomen imaging: a comparative study of siemens and toshiba models.  - 2nd multidisciplinary regional conference in science and technology (mrcst 2025).  . 

r. s. omar, s.n. p. naidu , s. r. parthasarathy , r. tukimin , n. a. zashidi , n. m. hidzir , f. k mohamed, s. m. fadzil1.  (2025).  occupational risk assessment and safety measures for uv and laser radiation exposure .  - 2nd multidisciplinary regional conference in science and technology (mrcst 2025).  . 

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, n.f. ismail, m.n. mazlan, a. ahmad, n.m. hidzir, nora almuqbil, zuhal y. hamd, mayeen uddin khandaker.  (2025).  assessment of thyroid counter accuracy using caesium-137 and europium-152 and personnel effective dose.  - journal of radiation research and applied sciences.  1 - 12. 

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, nor irwanie emeera mohd nor, wan syazlin wan yunoh, norsyahidah mohd hidzir, faizal mohamed, nurul muyassarah ibrahim, nur afrina zainal, muhammad shaheir abu samah, roha tukimin.  (2025).  radiofrequency electromagnetic field (rf-emf) exposure assessment at a nuclear facility: safety monitoring and public.  - sains malaysiana.  2755 - 2766. 

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.  . 

hauwau kulu shuaibu, faizal mohamed, mayeen uddin khandaker, aznan fazli ismail, ratna suffhiyanni omar.  (2023).  radioactivity and concomitant radiation dose from malaysian herbal plants.  - radiation physics and chemistry.  1-10. 

s. hashim , r.s. omar , s.k. ghoshal , n.z.h.a. hanifah , d.a. bradley , y.j. lee , c.l. goh.  (2023).  dose assessment of betatron electron beam: a key component of safe and secure industrial operations.  - radiation physics and chemistry.  1-9. 

ullmazleiney allmauzia, faizal mohameda, shahidan radimana, nur ratasha alia md. roslia, ratna suffhiyanni omar.  (2023).  polymerization of styrene in lyotropic liquid crystal lamellar phase via gamma and electron beam irradiation.  - radiation physics & cemistry.  1-7. 

muhammad abdullah rahmat, aznan fazli ismail, eli syafiqah aziman, nursyamimi diyana rodzi, ratnasuffhiyanni omar, wan mohd razi idris, tukimat lihan.  (2023).  exploring strategies post-revocation of licensing exemption for malaysia's tailing processing industry.  - sains malaysiana.  2267-2286.