ALARP: As Low as Reasonably Practicable. In essence, ALARP is the UK definition of ALARA, although they are not the same since ALARP suggests a balance between Risk and benefit (UK Case Law), where as ALARA takes social and economic factors into account. ALARP is key to UK Radiation Protection and introduces a test of reasonableness ensuring that workers work down from Dose Limits rather than up to them.

If you are looking for a practical demonstration of ALARP you may wish to try the Ionactive Radiation time, distance & shielding interactive ALARP widget. This widget allows you to adjust time, distance and shielding in an external radiation exposure scenario and explore the ALARP options available.