The term ALARP arises from UK legislation, particularly the Health and Safety at Work etc. Act 1974, which requires "Provision and maintenance of plant and systems of work that are, so far as is reasonably practicable, safe and without risks to health".
ALARP一詞最早是出現在英國法律中，特別是1974年工作健康與安全等法令（英语：Health and Safety at Work etc. Act 1974）（Health and Safety at Work etc. Act 1974），其中要求「在合理可行的範圍內，讓工廠及工作系統維持安全以及沒有健康風險」（Provision and maintenance of plant and systems of work that are, so far as is reasonably practicable, safe and without risks to health）。