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Medical radiation sources are used deliberately in the healthcare of patients and are designed for use in a controlled manner. There obviously are some adverse health risks associated with the use of radiation in medicine <ref name="Pub105"/>, with higher amounts of radiation being associated with higher risks. The undisputed health benefits of [[Application_of_ionising_radiation_in_healthcare_(demo)Application_of_ionising_radiation_in_healthcare#Diagnostic_Radiology|diagnostic radiology]]<ref name="Pub087">[[ICRP Publication 87]] Managing Patient Dose in Computed Tomography. Ann. ICRP 30(4), 2000.</ref><ref name="Pub102">[[ICRP Publication 102]] Managing Patient Dose in Multi-Detector Computed Tomography (MDCT). Ann. ICRP 37(1), 2007.</ref><ref name="Pub121">[[ICRP Publication 121]] Radiological Protection in Paediatric Diagnostic and Interventional Radiology. Ann. ICRP 42(2), 2013.</ref> using x-ray or nuclear medicine<ref name="Pub128">[[ICRP Publication 128]] Radiation Dose to Patients from Radiopharmaceuticals A Compendium of Current Information Related to Frequently Used Substances. Ann. ICRP 44(2S), 2015.</ref> may be accompanied by a generally very small risk (probability) of deleterious effects, while in radiation therapy<ref name="Pub127">[[ICRP Publication 127]] Radiological Protection in Ion Beam Radiotherapy. Ann. ICRP 43(4), 2013.</ref><ref name="Pub098">[[ICRP Publication 98]] Radiation Safety Aspects of Brachytherapy for Prostate Cancer using Permanently Implanted Sources. Ann. ICRP 35(3), 2005.</ref><ref name="Pub097">[[ICRP Publication 97]] Prevention of High-dose-rate Brachytherapy Accidents. Ann. ICRP 35(2), 2005.</ref><ref name="Pub086">[[ICRP Publication 86]] Prevention of Accidents to Patients Undergoing Radiation Therapy. Ann. ICRP 30(3), 2000.</ref> such risk can be much higher as large amounts of radiation are required.