Depends on which “conventional system”. Are we speaking as doctors or workers?
Gray and rems are used to describe exposure to persons when studying the dead and dying. MDs and physicists PhD types.
Exposure through standard work exposure still use the relatively new adopted measurement Sieverts and millisieverts and more commonly used measurements for industrial radiation workers are still allowed 5 R per year, every year and no upper nor maximum limit for one’s lifetime. There are documented cases of workers receiving chronic exposure to levels approaching what was long figured lethal doses with no 1st nor 2nd generation anomalies.
Wiki has a breakdown :
“Although the International System of Units (SI) defines the sievert (Sv) as the unit of radiation dose equivalent, chronic radiation levels and standards are still often given in units of millirems (mrem), where 1 mrem equals 1/1000 of a rem and 1 rem equals 0.01 Sv. Light radiation sickness begins at about 50–100 rad (0.5–1 gray (Gy), 0.5–1 Sv, 50–100 rem, 50,000–100,000 mrem).”
The irony that the standard units of measurement were changed from Curies to Becquerel, and from Roentgen to Sieverts.
The world couldn’t stand having the tradition radiation units named after a Polish/French woman and a German man, so they had to change them to Swedish man and a Swiss man.
Goes to show how little re: high level radiation exposures the world’s MDs really have data from. Public info is pretty slim, less than a few dozen.....
“Gray and rems are used to describe exposure to persons when studying the dead and dying. MDs and physicists PhD types.
Exposure through standard work exposure still use the relatively new adopted measurement Sieverts and millisieverts and more commonly used measurements for industrial radiation workers are still allowed 5 R per year, every year and no upper nor maximum limit for one’s lifetime.”
5 rem, not 5 R.
REM and Sievert are equivalent with a multiplier.