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Radiotherapy uses high energy radiation in a very controlled way to treat cancer and other diseases of the body. Radiation works by damaging the DNA inside cells causing them to stop reproducing and die. Abnormal cancer cells are more sensitive to radiation because they divide more quickly than normal cells. Over time, the abnormal cells die and the tumor shrinks. Normal cells can also be damaged by radiation, but they can repair themselves more effectively, just like your skin heals after sunburn.

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The main goal of radiation therapy is to maximize the radiation dose delivered to abnormal cells, such as cancer cells, while minimizing the dose received by normal cells surrounding them. This minimizes the chance of any side effects. The effects of ionizing radiation are not instant; the treatment benefit occurs over time. Typically, more aggressive tumors, whose cells divide rapidly, respond more quickly to radiation. Radiation therapy is painless treatment option and will not make patients radioactive.

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Radiation is often given with the intent of destroying tumors and curing the diseases. However, not all cancer can be cured with radiation. Sometimes radiation is used to relieve symptoms, such as pain. or it is used to prevent tumors from developing or spreading. It may be used alone or in combination with other treatments such as surgery or chemotherapy. If used before surgery, it will shrink the tumor to make it easier to remove. And, if used after surgery, it will destroy tumor cells that may have been left behind.

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Well, this question is hard to answer, and even harder to study. It is a contentions and continuously debated question in the field of radiation safety.   Low dose ionizing radiation is an interesting topic, but when you read this...
What is a LINAC? The Radiotherapy Workhorse   A linear accelerator is a machine that uses high frequency electromagnetic waves to accelerate electrons. This acceleration is done along a straight acceleration waveguide, hence the word linear. They then smash these...
It is estimated more than 50% of cancer patients will receive radiotherapy at some point during their treatment. And currently ⅓ of the population will be affected by cancer over their lifetime.  This means 16% or 1 out of every...
The Five R’s of Radiotherapy   Why do I need to get soo many radiotherapy treatments? Why can’t I just have one radiation treatment and be done with all this radiotherapy already?   Many patients have questions about their radiotherapy...
Cobalt: From Goblins Ore to Cancer Cure   Cobalt is fairly uncommon metal in nature, and even more uncommon in nature is the color blue. Cobalt in its pure form is a beautiful blue metal. This lead cobalt to be...
Why is radiation dangerous? and how can this be treated   I recently saw this question on Quora and thought I should have a go at answering it. There a was already and answer there, but I thought that people...
Is a Cure for Cancer being kept from use by the Big Drug Companies?   “Imagine a commercial plane crashed and there were some fatalities involved. You can be sure that would make the headline of every major newspaper. Well,...