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Frequently Asked Questions

Why is radiation therapy used in conjunction with other treatments?

Once a cancer diagnosis has been made you may be referred for a radiation oncology opinion. Best cancer outcomes occur where patient care plans are determined through discussions between multi-disciplinary cancer medical specialists. For example, if you have breast cancer, you are likely to have breast cancer surgery to remove the tumour, radiation therapy to destroy any remaining cancer cells and possibly receive chemotherapy or hormone therapy to destroy cancer cells that may have travelled to other parts of the body.

Where does radiation therapy fit into the treatment journey?

The use of radiation therapy as part of your treatment plan will depend on your diagnosis. For some tumours e.g. skin cancer, prostate or larynx, radiation therapy could be the only course of treatment, but for others, it may form part of a wider care plan.

Radiation therapy can increase the effectiveness of other treatments and you can be treated with radiation therapy before surgery to help shrink a tumour and allow less extensive surgery than would otherwise have been needed. Alternatively you may be treated with radiation after surgery to destroy small amounts of cancer cells that may have been left behind.

For example, if you have breast cancer, you may have surgery to remove the tumour first, chemotherapy to destroy cancer cells that may have travelled to other parts of the body and then radiation therapy to destroy any remaining cancer cells.

The best outcomes for patients occur when treatment plans are determined through discussions between multi-disciplinary cancer medical specialists. These specialists will review your case and use their expertise to determine the best combination of treatment and in which order you should receive it.

How does radiation therapy work?

Radiation therapy is the use of radiation to safely and effectively treat cancer and other diseases. It may be used to cure cancer, control the growth of the cancer or relieve symptoms caused by cancer such as pain. radiation therapy works by damaging cells. Normal cells are able to repair themselves, whereas cancer cells are less capable of repair. It is this difference that provides a biological advantage, which is used in planning radiation therapy treatments for different cancer types. To best harness this biological advantage radiation therapy is delivered usually in daily intervals, (Monday to Friday) called fractions. This allows time between daily treatments for the healthy cells to repair much of the radiation effect, while cancer cells are not as likely to survive.

Radiation Oncologists optimise the radiation dose to treat the cancer using a tumoricidal dose, while at the same time minimising (where possible avoiding) radiation dose to healthy organs and tissues surrounding the cancer. Sometimes radiation therapy is the only treatment a patient needs, at other times, it forms one part of a patient's multifaceted treatment regimen. For example, prostate and larynx cancers are often treated with radiation therapy alone, whereas a breast cancer may be treated with surgery, radiation therapy and chemotherapy. radiation therapy can increase the effectiveness of other treatments. For example, you can be treated with radiation therapy before surgery to help shrink a cancer and allow less extensive surgery than would otherwise have been needed. Or, you may be treated with radiation after surgery to destroy small amounts of microscopic cancer cells that may have been left behind.

Are there different kinds of radiation used?

Radiation therapy can be delivered in two ways: externally and internally.

  • During external beam radiation therapy, the radiation oncology team uses a machine called a linear accelerator (Linac) to direct high-energy X-rays at the cancer. This process is non-invasive and the majority of patients do not experience any sensation whilst receiving it.
  • Internal radiation therapy or brachytherapy involves placing radioactive sources (radioactive seeds) inside your body.


During external beam radiation therapy radiation is directed using an individualised number of radiation beams through the skin to the cancer and the immediate surrounding area in order to destroy the tumour and any nearby cancer cells.


Brachytherapy involves placing radioactive material into a tumour and its surrounding tissue by using either a high-dose or lose-dose method. Patients referred to our care with prostate cancer may be able to have their treatment delivered using either approach. The radioactive sources used in low-dose prostate brachytherapy, come as implantable "seeds". These are implanted permanently into the prostate gland and remain in the body after the sources are no longer radioactive.

How is radiation generated?

The radiation is generated by a machine called a Linear Accelerator-also known as a Linac, which converts electricity into radiation. The Linac is capable of producing high-energy X-rays in a variety of different energies for the treatment best suited for your cancer. Using advanced treatment planning software, we are able to control the size and shape of the radiation beams and direct them at your body to effectively treat your tumour whilst sparing the surrounding normal tissue.

Is radiation therapy safe?

Radiation has been used successfully to treat patients for more than 110 years. In that time, many advances have been made to ensure that radiation therapy is both safe and effective. We align treatment schedules and practices with current evidence based approaches. Your radiation oncologist will be able to explain the measures taken to ensure a safe reliable radiation dose delivery schedule for your situation.

Will I become radioactive after external beam radiation therapy?

No. Radiation is only present when being directed at the area of treatment whilst the machine is switched on. No radiation is left inside your body after the treatment; you will not be radioactive.

Hair loss

Temporary or permanent hair loss in the treated areas may occur. In the instance of radiation therapy hair will only fall out in the area of the body being treated. For example, if you are having radiation therapy to your head you will probably lose some hair from your scalp. If the area being treated includes an armpit or your chest, then it is only hair in these regions which is likely to fall out. This is a common side effect which can be discussed with your radiation oncologist.

Will the radiation therapy hurt?

No. radiation therapy is painless. During treatment, the majority of patients will experience no sensation and will only hear the sound of the treatment machine buzzing whilst it is switched on.

Will radiation therapy burn me?

After some weeks into your treatment, the skin and other tissues in the body react to the radiation, by becoming irritated and unpleasant. This is not a burn, but the body's inflammatory response to the radiation, the severity of which is dependent on the area of the body being treated, your general health and wellbeing, any medications or medical treatments you may be undergoing at the same time and the radiation dose prescribed. Your radiation oncologist will explain the likely severity of side effects in your case and ensure you are best prepared to manage them if they eventuate. Our nursing staff and radiation therapists are able to give you practical advice on how to manage this reaction throughout your treatment.

Will I be sick and sore from day one?

Not usually. radiation therapy has a cumulative effect. As a general rule it will take some time for any side effects to develop. Similarly it takes some weeks after the completion of treatment before they start to subside.

Will radiation therapy make me sick?

Radiation therapy treatment only directly causes nausea and vomiting when treatment is being delivered to the general abdominal region. Medications called antiemetics are prescribed in these circumstances and are can be very effective in controlling nausea caused by radiation therapy. The nursing staff can also advise on simple dietary and lifestyle adaptations that can help manage nausea alongside taking prescribed medication. Your Radiation Oncologist will discuss with you the likelihood of such side effects being experienced.

What is cancer?

Cancer is a generic name given to a group of diseases that involve uncontrolled multiplication of abnormal cells. This usually results in the area growing in size, affecting the original and adjacent organs and often results in the spread of the cancer to other sites of the body.

Some growths (tumours) are benign while others are malignant. Cancers are malignant growths. Benign tumours do not spread but they may cause a lump or put pressure on parts of the body near the tumour. They are often cured by surgical removal. Occasionally, radiation treatment may be given to contain the area of the tumour or reduce the risk of the tumour coming back.

Malignant tumours (cancer) are usually more active than benign tumours and tend to spread and invade other tissues. The original cancer site is called the primary tumour. If the cancer spreads to other organs or tissues, the cancerous areas are known as secondary tumours. Under the microscope, secondary cancers usually appear the same as the cells at the primary site, even though they appear elsewhere in the body.

Malignant tumours may be 'solid' or 'liquid'. 'Liquid' cancers are those involving the blood, such as leukaemia. Solid tumours may arise from any organ. In Australia, the most common cancers are breast cancer, bowel cancer, and melanoma (skin cancer) in females. In males, prostate cancer is the most common, followed by bowel cancer then melanoma (skin cancer). 

What is Accelerated Partial Breast Irradiation (APBI)?

Accelerated partial breast irradiation (APBI), is a localised form of radiation treatment (known as brachytherapy) that involves the insertion of a radioactive source to kill breast cancers cells that may remain after lumpectomy surgery. APBI delivers a high-dose of radiation while greatly reducing:

  • The required treatment time from 4-6 weeks to 1 week, and
  • The dose to normal breast tissue and critical organs such as the heart and lungs

This treatment option is only available to a specific group of breast cancer patients and will be discussed with you by your radiation oncologist if it is a feasible treatment option. This treatment is given twice a day over 5 days, while standard external beam radiation treatment involves 5 treatments per week for 4-6 weeks. 

What is Gamma Knife Surgery?

Gamma Knife radiosurgery (GKS) is a safe, effective and non-invasive procedure that uses radiation to treat conditions in and around the brain. It is sometimes used as a replacement for conventional surgery, but at other times it may be effective in situations where there is no conventional surgical alternative available. The radiation treatment is delivered with great precision to the target tissue within or around the brain, whilst at the same time minimising any dose to surrounding healthy tissue. The name 'Gamma Knife' is in some ways misleading - no knife or cutting implement is actually involved at any stage. The term 'Gamma Knife' is intended to convey the idea that this radiation treatment is in some ways delivered as though it were an actual knife, because it offers a similar sort of precision and targeting to that offered by actual surgery. It uses radiation in much the same way as a surgeon uses a knife.
For any more questions regarding the Gamma Knife.

Who are the members of the radiation therapy team?

  • Radiation Oncologists
  • Radiation Therapists
  • Medical Physicists
  • Radiation Oncology Nurses
  • Reception and Administration Staff
  • Read more detail about our staff and their role in your treatment

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Genesis Logo Small.pngGenesisCare is Australia’s leading provider of radiation oncology, cardiology and sleep treatments. We exist to fill the treatment gap for the biggest disease burdens in Australia - cancer and heart care - in an environment of substantial unmet demand from an ageing population. Click here to learn more