Article Per Year (5 Year)
p-Index From 2021 - 2026
0.408
P-Index
This Author published in this journals
All Journal Journal of Material Science and Radiation
Yap Siew Hong
Universiti Putra Malaysia
Materials Science & Nanotechnology Physics

Published : 2 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 2 Documents
Search

 1 
Safety Evaluation of MRI Magnetic Field Leakage from Different Configurations Yap Siew Hong; Siti Aisyah Mohd Nordin; Mohd Mustafa Awang Kechik; Muhammad Khalis Abdul Karim; Zarina Ramli; Hussien Baqjiah; Soo Kien Chen; Kean Pah Lim; Muhammad Kashfi Shabdin; Aliah Nursyahirah Kamarudin; Aris Doyan; Arebat Ryad Alhadei Mohamed; Abdul Halim Shaari
Journal of Material Science and Radiation Vol. 1 No. 1 (2025): April
Publisher : Balai Publikasi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Magnetic Resonance Imaging (MRI) systems generate intense static magnetic fields (SMFs), with fringe field propagation varying considerably between installations, even among scanners that operate at the same nominal field strength. This study investigates the safety implications of magnetic field leakage by quantifying and comparing SMFs distributions surrounding multiple MRI facilities. The assessment covers 1.5 T MRI scanners at Hospital Canselor Tuanku Muhriz (HCTM) and Hospital Pakar Kanak-Kanak UKM (HPKK), and 3 T scanners at the National Cancer Institute / Institut Kanser Negara (IKN), Pusat Pengimejan Diagnostik Nuklear (PPDN), and HCTM. Magnetic field intensities were recorded using a Magnetometer HP-01 provided by the Medical Radiation Surveillance Division (BKRP), Ministry of Health Malaysia, and visualised using MATLAB to model spatial field dispersion. Statistical tools, including Box and Whisker plots and the Shapiro-Wilk test, were employed to analyse magnetic field uniformity and containment. Specifically, 1.5 T scanners at HCTM and HPKK, and 3.0 T scanners at IKN, PPDN, and HCTM, each displayed distinct SMFs propagation profiles. These findings align with earlier studies conducted in Italy, confirming that magnetic field distributions near the magnet core can differ substantially based on scanner model and site-specific installation variables—even when B₀ remains constant. Notably, HCTM exhibited superior SMFs confinement, with lower standard deviation and a narrower distribution range, suggesting better shielding design. This enhances occupational safety in zones where radiographers frequently operate. The results reinforce the need for site-specific SMFs assessments and optimised shielding practices to maintain safe MRI environments for both staff and patients
Effect of SnO2 Addition on YBCO Superconducting Properties through Thermal Treatment Method Aliah Nursyahirah Kamarudin; Tan Kar Yeow; Mohd Mustafa Awang Kechik; Chen Soo Kien; Lim Kean Pah; Muhammad Kashfi Shabdin; Nurhidayah Mohd Hapipi; Muhammad Khalis Abdul Karim; Aris Doyan; Yap Siew Hong; Abdul Halim Shaari
Journal of Material Science and Radiation Vol. 1 No. 1 (2025): April
Publisher : Balai Publikasi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

In this study, YBa2Cu3O7-δ (YBCO) superconductors were synthesized using a thermal treatment method with the addition of 1.0 wt. % SnO₂. The synthesis of YBCO employed nitrate-based precursors and polyvinylpyrrolidone (PVP) as a capping agent to enhance homogeneity during the synthesis process. All samples were characterized using thermogravimetric analysis (TGA), X-ray diffraction (XRD), Scanning electron microscopy (SEM) and Four-point probe (4PP). TGA results of the pure YBCO sample confirmed the complete transformation of nitrate-based precursors into oxide forms prior to the formation of the YBCO phase. XRD pattern revealed that Y123 as a major phase and Y124 as a minor phase in all samples with orthorhombic crystal structure were preserved. However, the peak intensity of the Y123 was pronounced with the addition of the SnO2 sample, suggesting the enhancement phase formation due to the presence of SnO₂. The electrical resistivity measures revealed a sharp superconducting transition in all samples. However, the reduction in superconducting transition temperatures for the SnO2 addition were observed where the Tc-onset decreased from 91.70 K to 89.25 K for the YBCO and YBCO + 1.0 wt.% of SnO2, respectively. This also exhibited the broadening of transition width, ΔTc indicating the suppression of superconducting properties with SnO₂ inclusion. SEM analysis showed notable differences in microstructure. The pure YBCO sample exhibited a larger average grain size of 1.32 µm, while the YBCO + 1.0 wt. % SnO2 sample formed small and rounded grains with smoother edges, potentially impacting intergranular connectivity and charge transport. Therefore, the addition of 1.0 wt. % SnO2 to YBCO enhanced the formation of the Y123 phase but adversely affected the superconducting transition temperature and microstructural features. These findings highlight the dual role of SnO2 in promoting phase purity while modifying grain morphology and electrical performance, offering insight into the optimization of dopants in high-temperature superconductors
Co-Authors Abdul Halim Shaari Aliah Nursyahirah Kamarudin Arebat Ryad Alhadei Mohamed Aris Doyan Chen Soo Kien Hussien Baqjiah Kean Pah Lim Lim Kean Pah Mohd Mustafa Awang Kechik Muhammad Kashfi Shabdin Muhammad Kashfi Shabdin Muhammad Khalis Abdul Karim Nurhidayah Mohd Hapipi Siti Aisyah Mohd Nordin Soo Kien Chen Tan Kar Yeow Zarina Ramli