21 CFR 179.21 - Sources of radiation used for inspection of food, for inspection of packaged food, and for controlling food processing.
(a) The radiation source is one of the following:
(1) X-ray tubes producing X-radiation from operation of the tube source at a voltage of 500 kilovolt peak or lower.
(2) Sealed units producing radiations at energy levels of not more than 2.2 million electron volts from one of the following isotopes: Americium-241, cesium-137, cobalt-60, iodine-125, krypton-85, radium-226, and strontium-90.
(3) Sealed units producing neutron radiation from the isotope Californium-252 (CAS Reg. No. 13981-17-4) to measure moisture in food.
(4) Machine sources producing X-radiation at energies no greater than 10 million electron volts (MeV).
(5) Monoenergetic neutron sources producing neutrons at energies not less than 1 MeV but no greater than 14 MeV.
(b) To assure safe use of these radiation sources:
(1) The label of the sources shall bear, in addition to the other information required by the Act:
(i) Appropriate and accurate information identifying the source of radiation.
(ii) The maximum energy of radiation emitted by X-ray tube sources.
(iii) The maximum energy of X-radiation emitted by machine source.
(iv) The minimum and maximum energy of radiation emitted by neutron source.
(2) The label or accompanying labeling shall bear:
(i) Adequate directions for installation and use.
Title 21 published on 2015-04-01
The following are ALL rules, proposed rules, and notices (chronologically) published in the Federal Register relating to 21 CFR Part 179 after this date.