Who We Are
About Zenith
Radiation Safety
Radiation Safety Requirements Australia-Wide
Excellence in Radiation Safety
Zenith Radiation Safety offers high-quality advice on all aspects of radiation matters — from shielding design and compliance testing to dosimetry assessment and radiation safety training for your practice.
We work with you to ensure your radiation practices comply with the relevant radiation laws and to protect your staff from the harmful effects of ionising and non-ionising radiation. We pride ourselves on delivering quality work that adds value and exceeds our clients’ expectations.
Our Accreditation
Our Heritage
Formerly Sieverts Radiation Protection Consultancy
Zenith Radiation Safety is the continuation of the business formerly known as Sieverts Radiation Protection Consultancy. The business has recently undergone a change in management and ownership, and the new branding reflects a fresh start under new leadership.
Our purpose remains the same as it has always been: to provide proper advisory services, reliable compliance support and attentive customer service that help businesses remain compliant in the Australian state or territory in which they operate — and that deliver real peace of mind to the people who run them.
Clients who have worked with us under the Sieverts name will continue to be supported by the same specialist team of medical physicists and support staff they already know.
“Zenith Radiation Safety looks forward to providing you with high-quality advice to meet the radiation needs of your practice, business or organisation.”
- Raymond Huan, CEO
Serving with a team of Experienced & Knowledgeable experts
Why Work With us
The Zenith Difference
From initial consultation through to certification, we manage the compliance process with precision and clarity. Our clients trust us because we consistently deliver expert advice and reliable outcomes, on time.
Tailored Solutions
We use a consultative approach for each business by understanding their unique radiation needs, acquiring critical data and then developing a tailored solution.
Timely Results
We understand that businesses cannot afford down time or risk issues with radiation compliance. Zenith Radiation Safety prides itself on high-quality advice and service in a timely manner.
Attention to Detail
Excellence can only be increased through time and effort spent on the details. This is why hundreds of clients trust Zenith Radiation Safety as their radiation protection consultants.
Certified
Zenith Radiation Safety is recognised for its contribution and involvement in the radiation industry across Australia. We are a proud company supporter and holds corporate membership with the Australasian College of Physical Scientists and Engineers in Medicine, the Australasian Radiation Protection Society and the Australian Dental Industry Association.
Qualified Experts
Our team of radiation advisors are qualified and experienced medical physicists specialising in radiation physics. They can provide expert advice on all aspects of radiation safety and protection in an easy and understandable manner.
Clients We Protect
Our Team of Experts
Raymond Huan
Chief Executive Officer
B.Eng, MBA (Strategic Management & International Business)
Raymond brings over 15 years of business leadership and strategic consulting experience to his role as CEO of Zenith Radiation Safety. Since 2009, Raymond has worked closely with the team as a trusted business consultant, guiding the organisation through significant growth whilst maintaining the exceptional service standards for which the business is recognised across the radiation safety industry.
With a background in engineering and advanced training in strategic management and international business, Raymond combines analytical rigour with a people-centric leadership approach. His primary focus as CEO centres on fostering a thriving organisational culture, empowering the talented team of medical physicists and support staff, and ensuring sustainable business practices that enable Zenith Radiation Safety to continue delivering world-class radiation safety advice and compliance services. Raymond has worked collaboratively with the internal team to manage the systematic expansion of the organisation across multiple Australian states. This growth has been carefully calibrated to preserve the personalised quality service delivery and attention to detail that define the business’s reputation in the industry.
As CEO, Raymond is committed to supporting the professional development of the team and creating an environment for them to thrive. Outside of work, Raymond enjoys family life with his wife Sharon, who also contributes to the Administrative team.
Esther Y
Manager
Esther is an integral part of our Management Team, providing operational oversight to ensure consistent, professional and quality service delivery to our valued clients. Stepping into the Manager role, Esther brings together strong commercial expertise with a people-focused approach — supporting both our staff team and our clients to ensure a thriving, well-run workplace.
Esther holds a Bachelor of Commerce in Accounting, specialising in taxation, and has worked for both large and small accounting firms. Over her time with the business, Esther’s experience has proved invaluable; she has a depth of knowledge on shielding requirements across Australia, oversees our Shielding services, and is well placed to guide the operational, administrative and financial side of the business as it moves into its next chapter as Zenith Radiation Safety.
Known for her attention to detail and her ability to put people at ease, Esther is focused on supporting our team of medical physicists and administrative staff to deliver the standard of service the business has long been recognised for.
Physics Team
Nazia P
Senior Medical Physicist
BSci, MAppSci (Medical Physics)
Nazia is a Medical Physicist with expertise in diagnostic imaging, radiation safety, regulatory compliance, and radiation shielding design. She provides radiation compliance testing, shielding assessments, and Radiation Safety Officer (RSO) services across Queensland, New South Wales, Victoria, Tasmania, and the Northern Territory.
With a Master of Applied Science in Medical Physics from Queensland University of Technology and a Master of Public Health from Torrens University Australia, Nazia combines strong technical expertise with a comprehensive understanding of healthcare regulations and patient safety. Her work includes compliance testing of diagnostic imaging equipment — including CT, mammography, fluoroscopy, general X-ray, dental imaging (including CBCT), and cabinet X-ray systems — as well as laser safety assessments.
Nazia holds radiation accreditation and licensing across multiple Australian jurisdictions and has been recognised for academic excellence, including placement on the Dean’s List at Queensland University of Technology. She is passionate about improving radiation safety practices, supporting healthcare providers through regulatory compliance, and promoting the safe and effective use of diagnostic imaging technologies.
Rajdeep K
Medical Physicist
BSci, MSci (Medical Radiation Physics)
Rajdeep graduated with a Bachelor of Science from India and Master of Science (Medical Radiation Physics) from the University of Wollongong. Her research revolved around the validation of determination of radiation dose in lung phantoms using the PINNACLE treatment planning system and innovative radiotherapy methods.
She actively participated in helping accomplish the balance of diagnostic image quality and radiation dose in close collaboration with physicians, technologists, and technical staff during her internship at Wollongong Hospital. Almost all of the equipment used by the clinicians in today’s hospitals and clinics are designed and put into clinical practice by medical physicists and clinical engineers, so physicists offer reliability and continuity in medical physics services worldwide. In her work with the team, Rajdeep enjoys exploring the radiation safety programs and pathways, from radiation safety to compliance testing, ensuring the safe and effective use of radiation sources for both the public and staff working in these environments.
Hanieh H
Medical Physicist
BSci (Phys & Eng), MAppSci (Medical Physics)
Hanieh holds a Bachelor’s degree in Physics, Engineering from Iran and a Master of Applied Science in Medical Physics from Queensland University of Technology. With nearly 8 years of experience in quality control of diagnostic X-ray devices, dosimetry and radiation protection, Hanieh is an experienced member of the team. Her research project focused on improving dose measurement accuracy and uncertainty using innovative TLD and OSLD methods for in-vivo dosimetry.
Eager to explore and develop new equipment while honing her troubleshooting skills, Hanieh is an avid researcher who seizes every opportunity to learn new methods and techniques. She possesses a deep passion for learning and research, particularly in the innovative methods of Radiation Therapy for cancerous tumours. This pursuit enables her to work towards her ultimate aspiration: contributing to a cancer-free world, especially for children.
Shaun P
Medical Physicist
BSci, MAppSci (Medical Physics)
Shaun joins our team with a background in radiation oncology medical physics where he worked on improving outcomes for cancer patients. He is interested in ways to reduce dose to patients while maintaining image quality and therapeutic outcomes through mathematical modelling.
In his role as a Medical Physicist with the team, Shaun enjoys meeting our clients and using his extensive experience in customer service to continue our tradition of excellence in quality service delivery. Shaun has a long history of delivering quality service to customers, helping them to achieve great outcomes and we are glad to have his vast experience to draw on. In his spare time, he enjoys exploring new places where he can go rock climbing and playing online chess.
Admin Team
Sarah
Sarah is an integral part of our admin team, coordinating bookings for our clients and managing our staff schedules with finesse. She came over from South Africa to Australia in 2008. Her background includes a Diploma in Veterinary Nursing, work as a Pharmaceutical Rep as well as studying as a Teacher’s Aide.
Outside of work, Sarah enjoys spending time with her husband and four kids, as well as her dogs and cat. She enjoys camping, walking, cooking or diving into a good book and hopes to add a cute cow to her pet collection.
Mekala
Mekala brings a wealth of experience in logistics, human resources and workplace health and safety to our team. Her years of administrative experience, focussing on quality service delivery, make Mekala an asset to the team. Mekala assists our clients with providing advice and access to information regarding radiation protection, with a special focus on our national travel schedules, connecting our clients from across all states of Australia.
In her spare time Mekala enjoys outdoor adventures with her family, road trips and watching her kids play sports.
Rebecca
Bookkeeper
Rebecca is our Bookkeeper, assisting our clients and team with our day-to-day financial management. Rebecca has a Bachelor of Commerce, a double major in Accounting & Finance, and is a certified CPA. During her career, she has had experience in a variety of roles including payroll, tax consulting and management accounting. Rebecca enjoys every opportunity to enhance herself and her career and is thriving in her new role within our accounts team.
In her spare time, she enjoys making Amigurumi (‘crocheted stuffed yarn creatures’).
External Consultants
Prof. Ng Kwan-Hoong
Ph.D., FIPM, MIPEM, Board Certified ABMP.
rofessor Ng is a Professor of Medical Physics, University of Malaya, and Senior Consultant at the Department of Radiology, University of Malaya Medical Centre, Kuala Lumpur, Malaysia. He is board certified by the American Board of Medical Physics (ABMP). His research areas are in medical imaging, radiation protection, image processing, mammography and health technology assessment.
He has served as an International Atomic Energy Agency (IAEA) expert in radiology quality assurance and radiation protection, and is a member of World Health Organization (WHO) expert committee in radiation medicine. He serves as the editor of the Electronic Medical Physics World (EMPW), and sits on the editorial board of the Australasian College of Physical Scientists & Engineers in Medicine (ACPSEM).
He is the chairman of the International Advisory Board of the International Organization for Medical Physics (IOMP) and a council member for the International Union of Physical and Engineering Science in Medicine (IUPESM). He is the founding president of the South East Asian Federation of Medical Physics.
Professor Ng has published over 60 papers in peer-reviewed journals and presented over 170 scientific papers. He has also organised and directed several workshops on radiology quality assurance and scientific writing. He is also author/co-author of four book chapters and seven books.
Dr Kam L Lee
BSc(Hons), MSc, PhD, CEng, QMPS, MIET, MACPSEM
Dr Lee is a Chartered Engineer, a qualified medical physicist and an ACPSEM-certified medical physicist in radiological physics. Dr Lee has extensive experience in shielding calculations for radiological and dental premises, new equipment commissioning and other diagnostic imaging medical physics services. Dr Lee is an adjunct senior lecturer with the Department of Medical Imaging & Radiation Sciences, Monash University.
He is a member of the ACPSEM general X-ray and fluoroscopy quality assurance working groups and a member of the image guided interventional procedures liaison panel. His research areas include medical imaging, dosimetry, population dose and DRL, image processing, data science and artificial intelligence. He has published papers in various peer-reviewed journals and served as reviewer for various journals.
Start With a Free Consultation
Let's Protect Your Practice
Our expert team provides testing, design, training, and compliance certification to keep your radiation practice protected, and your business operating without interruption. Peace of mind starts with one conversation. Whether you’re opening a new practice, upgrading equipment, or unsure where your compliance stands – our team will point you in the right direction.