Radiation-hardened components designed for military or nuclear applications can survive up to 100 Mrad (1 MGy).
In the 1930s the roentgen was the most commonly used unit of radiation exposure.
The International Committee for Weights and Measures (CIPM) has not accepted the use of the rad.
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It can be good enough for a small personal home page as well as for a big company WAP site (price lists, WAP versions of newspapers, etc).
This unit is obsolete and no longer clearly defined.
One roentgen deposits 0.877 rad in dry air, 0.96 rad in soft tissue, These conversions to absorbed energy all depend on the ionizing energy of a standard medium, which is ambiguous in the latest NIST definition.Whole body doses of more than 1,000 rad are almost invariably fatal.