What is internal radiotherapy?

Types of internal radiotherapy

There are two types of internal radiotherapy:

  • Brachytherapy: This is when a solid radioactive source is placed into or close to the tumour.
  • Radioisotope therapy: This is when a liquid source of radiation is used inside the body. It’s also called radionuclide therapy.

Your healthcare team will be able to provide you with more detailed information about these types of radiotherapy.

Back to Internal radiotherapy explained


Brachytherapy treats cancer by placing a high dose of radiation directly inside or near to the tumour.


Radioisotope therapy targets cancer cells with a radioactive liquid.