Roentgen (unit) this derivative quantity the roentgen equivalent physical (rep) to distinguish it from the ICR roentgen. The introduction of the roentgen measurement unit, which relied upon measuring the ionisation of air, replaced earlier less accurate practices that relied on timed exposure, film exposure, or fluorescence. This led the way to setting exposure limits,and the National Council on Radiation Protection and Measurements of the United States established the first formal dose limit in 1931 as 0.1 roentgen per day. The International X-ray and Radium Protection Committee, now known as the International Commission on Radiological Protection (ICRP) soon followed with a limit of
Which Medical Device Which Medical Device Which Medical Device is a review site for medical devices with reviews, medical device news and videos of medical procedures. Users can rate and review medical devices listed on the website, or suggest devices for inclusion and review. The website also publishes device reviews from an editorial team and encourages users to submit detailed reviews. Device manufacturers pay a fee to submit expanded product information to the website. Which Medical Device was launched in September 2010 by Dr Philip Haslam (an Interventional Radiologist based at the Freeman Hospital, Newcastle upon Tyne, United Kingdom) alongside colleague Mr Craig