Metastates cells in brain

My father has metastases cells in right side of his brain. Doctors suggested radio therapy  for that. We don't know how it will be done. Please tell me the pros and cons also can we travel after radio therapy .? Is it one time or repeatedly done. ? If repeatedly how many days gap they will have..?
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Radiotherapy can be given in two different ways – from outside the body (external radiotherapy) or inside the body (internal radiotherapy). External radiotherapy usually involves using a machine called a linear accelerator, which focuses high-energy radiation beams onto the area requiring treatment. External beam radiotherapy is completely painless. External beam radiotherapy usually involves a series of daily treatments over a number of days or weeks. Internal radiotherapy can involve placing a small piece of radioactive material temporarily inside the body near the cancerous cells (known as brachytherapy), or the use of a radioactive liquid that's swallowed or injected. The radiation emitted by internal radiotherapy is painless, though the procedure to insert the source can sometimes cause mild discomfort.
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