astronomy

Michael Repacholi

Michael Repacholi is a astronomy topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Michael Repacholi rather than just read about it. In short: Michael Harry Repacholi (born 30 June 1944 in Taree, NSW, Australia) is an Australian biophysicist and radiation protection expert. He is one of the pioneer scientists and foremost authorities in Radiobiology in the world, including radiation protection standards for ionizing radiation and non-ionizing radiation across the electromagnetic spectrum.

Key takeaways

Michael Repacholi belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Michael Repacholi to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Michael Repacholi from memory before moving on to harder problems.

Reference excerpt

Michael Harry Repacholi (born 30 June 1944 in Taree, NSW, Australia) is an Australian biophysicist and radiation protection expert. He is one of the pioneer scientists and foremost authorities in Radiobiology in the world, including radiation protection standards for ionizing radiation and non-ionizing radiation across the electromagnetic spectrum. He was one of the founders and past presidents of the International Commission on Non-Ionizing Radiation Protection (ICNIRP) and founder and director of several projects in the World Health Organization, including the International Electromagnetic Fields (EMF) Project. Repacholi was also active in the study of the health consequences of the Chernobyl accident in the nuclear reactor, in Ukraine.

Education Repacholi received his BSc in Physics at the University of Western Australia in 1965, a Master of Science at the University of London, United Kingdom in 1969, and a Doctor of Philosophy in Biology at Ottawa University, Canada, in 1980.

Career After graduation, he started working as a radiation protection physicist at the State X-Ray Laboratory in Perth. He went on to study for an MSc degree in radiobiology from London University, UK. After completing his master's degree in 1969, he was offered a position as a radiation physicist at the Alan Blair Memorial Hospital in Regina, Saskatchewan, Canada where he worked as a radiotherapy treatment planner for cancer patients. While in Regina, he collaborated with John R Cunningham and Harold E Johns (designer of the first cobalt-60 and betatron cancer treatment units) at the Ontario Cancer Institute in Toronto, to develop and use remote computer planning programs for cancer treatment. He was then offered a position as a radiation protection scientist at the Radiation Protection Bureau of Health and Welfare Canada in Ottawa. During this time, he was promoted Head of the Non-Ionizing Radiation (NIR) Section, responsible for developing regulations on microwave ovens, radiofrequency safety standards, as well as ultrasound, ultraviolet and laser safety procedures. During this period, he completed his PhD in Biology from Ottawa University in Canada in 1980, under the advisorship of Professor Jacob Gordin Kaplan. Repacholi then took up the position of Chief Scientist at Royal Adelaide Hospital in South Australia in 1983 where he continued work in radiation protection and research on applications of electromagnetic fields (EMF) for medical procedures. Laser research programs involved the use of Nd:YAG lasers for tonsillectomy and CuBr lasers for removal of port-wine stains. From 1988 to 1990 Dr Repacholi was President of the Australasian Radiation Protection Society, and in the period 1989–1991 President of the Australian College of Physical Scientists and Engineers in Medicine. He was subsequently elected as a Fellow of both professional societies. He was seconded to the Australian Radiation Laboratory (now called the Australian Radiation Protection and Nuclear Safety Agency, ARPANSA) to conduct animal research to determine whether exposure to extremely low frequency fields (ELF) or radiofrequency fields could promote cancer in genetically engineered mice that were predisposed to get lymphoma. The Eμ-Pim1 mouse was considered to be a very sensitive model for this. RF fields were reported to have carcinogenic potential, but two subsequent replication studies failed to reproduce this result. However, this Eμ-Pim1 mouse study stimulated a huge amount of research among EMF scientists around the world. Repacholi was appointed an Officer of the Order of Australia in the 2025 King's Birthday Honours for "distinguished service to medical research as a radiation protection physicist, to environmental health, and to professional medical societies".

Work on non-ionizing radiation protection

In the years between working in Ottawa and then in Adelaide, Repacholi became a founding member and subsequent chairman of the International Non-Ionizing Radiation Committee of the International Radiation Protection Association (INIRC/IRPA). This committee was responsible for developing international guidance on NIR protection and particularly exposure limits to EMF, that quickly became accepted by many countries dealing with significant public concern about health effects from these fields. This committee was then elevated by IRPA to become an independent international commission similar to the very successful International Commission on Radiological Protection (ICRP) for ionizing radiation. Repacholi was elected as the founding Chairman of the International Commission on Non-Ionizing Radiation Protection (ICNIRP) in 1992. ICNIRP provides guidelines on limiting exposure to all non-ionizing radiations and its guidelines on radiofrequency fields, especially from mobile communications equipment, are now accepted as the international standard by over 50 countries around the world, including Australia. Dr Repacholi was awarded the Health Physics Society’s, W.G. Morgan Lectureship for "Outstanding international contribution to the radiation field" in June 1993 and honorary life membership in the Italian Radiation Protection Society in 1994. During Repacholi's chairmanship of ICNIRP, the Commission became a formally recognized Non-Governmental Organization (NGO) in formal relations with the World Health Organization (WHO), the International Labour Office (ILO) and the European Commission (EC). ICNIRP continues to work closely with these bodies on all matters related to non-ionizing radiation protection. Repacholi wrote a history of events leading up to the formation of ICNIRP in 2017.

… excerpt ends here. Continue reading the full article.

Worked examples

Example 1 — a first encounter with Michael Repacholi

Start with the simplest possible case. Write down what Michael Repacholi claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In astronomy, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Michael Repacholi before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Michael Repacholi ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Michael Repacholi

In research: Michael Repacholi appears in astronomy research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Michael Repacholi in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Michael Repacholi is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1944 births, Alumni of the University of London, Australian biophysicists, so understanding it makes those chapters shorter.
In everyday life: Look for Michael Repacholi outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Michael Repacholi in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Michael Repacholi means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Michael Repacholi out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Michael Repacholi in simple terms?

Why does Michael Repacholi matter?

Because it connects several astronomy ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Michael Repacholi?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Michael Repacholi.