radioactive standard

radioactive standard

[¦rād·ē·ō′ak·tiv ′stan·dərd]
(nucleonics)
A sample of radioactive material which contains a known number and type of radioactive atoms at some definite time; used to calibrate radiation measuring instruments.
References in periodicals archive ?
In Yamagata Prefecture in northeastern Japan, a group which promotes Yonezawa brand beef is mulling imposing a radioactive standard stricter than the government-set limit of 500 becquerels per kilogram.