Radiation dosimetry, protection and legislation

Radiation is present in the environment naturally and we are all exposed to some extent. The effect this radiation has on humans depends on the type, source and level of radiation and on the age of the patient. Legislation guides the dose limits for staff and the public and the recommended doses for patients undergoing medical exposure. The mantra for radiation exposure for everyone is ALARP (As Low As Reasonably Practical).

This chapter covers the sources of radiation to staff, how the dose received is measured and how to protect against radiation exposure.

In this chapter I have also included patient dose measurements and factors affecting exposure for X-ray, CT and nuclear medicine imaging.



Radiation Hazard sign


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