High Energy X-Rays

Test yourself

High Energy X-Rays

Radiotherapy is effective against cancer because cancer cells reproduce rapidly and, consequently, are more sensitive to radiation.

Illustrative background for RadiotherapyIllustrative background for Radiotherapy ?? "content


  • The central problem in radiotherapy is to make the dose for cancer cells as high as possible while limiting the dose for normal cells.
  • The ratio of abnormal cells killed to normal cells killed is called the therapeutic ratio, and all radiotherapy techniques are designed to enhance this ratio.
Illustrative background for Concentrating radiation Illustrative background for Concentrating radiation  ?? "content

Concentrating radiation

  • Radiation can be concentrated in cancerous tissue by a number of techniques.
  • One technique is to have a narrow beam of radiation is passed through the patient from a variety of directions with a common crossing point in the tumour.
  • This concentrates the dose in the tumour while spreading it out over a large volume of normal tissue.

Jump to other topics

1Measurements & Errors

2Particles & Radiation


4Mechanics & Materials


6Further Mechanics & Thermal Physics (A2 only)

7Fields & Their Consequences (A2 only)

8Nuclear Physics (A2 only)

9Option: Astrophysics (A2 only)

10Option: Medical Physics (A2 only)

11Option: Engineering Physics (A2 only)

12Option: Turning Points in Physics (A2 only)

Go student ad image

Unlock your full potential with GoStudent tutoring

  • Affordable 1:1 tutoring from the comfort of your home

  • Tutors are matched to your specific learning needs

  • 30+ school subjects covered

Book a free trial lesson