Who We Are

About Us

The Leading Radiation Consultancy

Excellence in radiation safety

Sieverts Radiation Protection Consultancy offers high quality advice on all aspects of radiation matters from designing shielding plan, conducting compliance testing, performing dosimetry assessment to providing radiation safety training for your radiation 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 radiation and non-ionising radiation.  

At Sieverts Radiation, we pride ourselves in delivering quality work that adds value and exceeds our clients’ expectations.

"Sieverts Radiation Protection Consultancy looks forward to providing you with high quality advice to meet the radiation needs of your practice, business or organisation."
William Tan

Why Work With Us


Sieverts is recognised for its contribution and involvement in the radiation industry across Australia. Sieverts is 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.


We use a consultative approach for each business by understanding their unique radiation needs, acquiring critical data and then developing a tailored solution.

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.


We understand that businesses cannot afford down time or risk issues with radiation compliance. Sieverts prides itself on delivering 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 Sieverts as their radiation protection consultants.

Experienced & Knowledgeable


William Tan

Director of Sieverts Radiation Protection Consultancy
B.Medical Eng, Grad Dip App Sci (Medical Physics)

William is a qualified medical physicist specialising in radiation safety for radiation facilities across Australia.

William holds an extensive range of experience in all aspects of radiation and focuses exclusively on ensuring that all radiation practices comply with the relevant radiation laws, regulations and standards.

William is accredited and qualified in Queensland, New South Wales, Victoria, South Australia, Western Australia, Tasmania, Australian Capital Territory and the Northern Territory to provide radiation safety and protection advice and to certify radiation apparatus and premises to the relevant safety standards.

William is also a qualified Radiation Safety Officer across Australia and a full member of the Australasia College of Physical Scientists and Engineers in Medicine (ACPSEM), the Australasian Radiation Protection Society (ARPS) and the Australian Dental Industry Association (ADIA).

William served as the Vice President of the ADIA for Queensland from 2018 to 2020. William is well respected in the radiation industry and has sat as a board member with the Queensland Radiation Health to review the state's radiation safety standards.



Ceren HB

Senior Medical Physicist
BSci, MAppSci (Medical Physics)

Ceren is an experienced medical physicist and is particularly interested in the diverseness of the profession. She has a keen mind towards all aspects of physics and applies her knowledge to healthcare.

Ceren completed her Masters in medical physics project on the development and validation of an optical simulation of tumour movement monitoring during radiotherapy. The research project specifically addressed the issue of image guide radiation therapy: particularly associated with monitoring of tumour movement during actual delivery of external beam radiation therapy (intra fraction). It also considered the application of novel quantitative real-time ultrasound imaging, the specific aim being to dynamically monitor tumour movement during actual external beam radiotherapy delivery using a robotically-controlled ultrasound system.


Nazia P

Medical Physicist
BSci, MAppSci (Medical Physics)

Nazia graduated with bachelors in Physics and a Masters in Applied Sciences (Medical physics) from Queensland University of Technology. Her research revolved around the validation of small field detectors that included the W2 scintillator detector, Diamond detector, RAZOR nano chamber and CC01 in small field dosimetry using Monte Carlo simulation (EGSnrc and DOSXYZnrc).

Nazia is interested in science, especially Medical Physics and wants to explore the application of physics to improve human life. She thinks the current developments in Physics are overwhelming and open-up opportunities for the younger generation to delve into and use for the benefit of human beings. She is keen to explore the application of the theories to everyday life and improve living standards.

Rajdeep K - Medical Radiation Physicists

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 Sieverts Rajdeep is interested in exploring the radiation safety programs and pathways, from radiation safety to compliance testing, to ensure the safe and effective use of radiation sources for both the public and staff working in these environments.
Hanieh Hajinorouzi

Hanieh H

Medical Physicist
BA Phy Eng, MA Sci Phy
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 new addition to the Sieverts 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 tumour's. This pursuit enables her to work towards her ultimate aspiration: contributing to a cancer-free world, especially for children.

Mandeep L

Medical Physicist
BSci, MSci (Medical Radiation Physics)
Mandeep is a safety-conscious and quality-focused professional who graduated with a Master of Science (Medical Radiation Physics) from University of Wollongong, NSW. Mandeep has a curious nature and is interested in exploring the impact of radiation on humans and how this can be used for improved safety outcomes. Mandeep is interested in learning and research, especially in the field of Proton Radiation Therapy, in the treatment of cancer and noncancerous tumours.

Jackie C

BSci, GDipPH, MAppSci (Medical Physics)

Jackie is a medical physicist with many years of experience in radiation compliance and safety.

Jackie completed her Masters project titled: Feasibility study of the use of an Electronic Portable Imaging Devices (EPID) Dosimetry Calibration Compensator. The project was to develop and verify a mean to maintain a correction in pixel variation without correcting beam profile in electronic portal imaging device with Monte-Carlo simulation using EGSnrc and DOSEXYZnrg.

As a medical physicist, Jackie continues to develop her experience in radiation protection, dose optimisation and radiation therapy – treatment and pre-treatment dose verification.

Esther W Physicist


B Med Rad Physics, MPhil (Physics)

Esther graduated with a Bachelor of Medical Radiation Physics and a Masters of Philosophy in Medical Radiation Physics from the University of Wollongong, NSW.

Esther’s thesis considers the Impact of 4DCT Dataset Representation on Radiotherapy Dose Calculations. It focused on how using different methods of reconstructing 4DCT datasets affected treatment planning and dose calculations for a moving tumour within the body. eg: lung tumours.

As a medical physicist, she is particularly interested in the innovative techniques used in cancer treatment that require little or no invasive surgical procedures to treat cancers such as Stereotactic Body Radiation Therapy (SBRT), which is a method of using medical imaging techniques to locate and target cancers with highly precise radiation treatment.

Daniel M Physicist

Daniel M

BSci (Physics), MAppSci (Med Physics)

Daniel is a medical physicist with a keen interest in diagnostic and therapeutic nuclear medicine imaging. He has a strong working knowledge of radiation safety compliance program to ensure public safety.

Daniel completed his Masters research on Monte Carlo simulation to Relative Biological Effectiveness (RBE) weighted dose for 50 kV therapy.

Sypnosis – RBE of low energy x-rays have been found to have a higher RBE than x-rays in the megavoltage range. The research project investigated the relative biological effectiveness of a 50 kVp beam used for superficial and intraoperative therapy. It was found by a combination of physical measurements and Monte Carlo simulations that the 50 kVp beam produced has an RBE greater than unity relative to a Co-60 beam.


Sheena Abraham
Esther Yeow
Esther Yeow


Prof. Ng Kwan-Hoong

Ph.D., FIPM, MIPEM, Board Certified ABMP.

Professor 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 organized and directed several workshops on radiology quality assurance and scientific writing. He is also author/co-author of four book chapters and seven books.

Ms Lucy Sim

BSc (Physics), MSc (Medical Physics), RO CMPS
Lucy is a medical physicist specialising in the radiation safety for radiation oncology treatment facilities in both designing new facilities and upgrading existing facilities. She has working knowledge of shielding calculations for new treatment bunker and upgrades, new equipment commissioning and independent radiation survey. Her research areas include medical imaging, image reconstruction, radiation oncology and radiation biology with clinical expertise in medical imaging physics, radiation safety and dosimetry. She is a member of the Australasian College of Physical Scientist and Engineers in Medicine (ACPSEM).

Dr Kam L Lee

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 & amp; 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 published papers in various peer-reviewed journals and served as reviewer for various journals.

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