subchapter_subject: "FOOD FOR HUMAN CONSUMPTION (CONTINUED)"
part_code: "179"
part_subject: "IRRADIATION IN THE PRODUCTION, PROCESSING AND HANDLING OF FOOD"
subpart_code: "B"
subpart_subject: "Radiation and Radiation Sources"
section_number: "179.21"
section_subject: "Sources of radiation used for inspection of food, for inspection of packaged food, and for controlling food processing."
cfr_reference: "21 CFR 179.21"
title_name: "Title 21"
title_subject: "Food and Drugs"
parts_covered: "Parts 170 to 199"
revised_date: "Revised as of April 1, 2019"
publication_date: "As of April 1, 2019"
contains_description: "Containing a codification of documents of general applicability and future effect"
publication_info: "Published by the Office of the Federal Register National Archives and Records Administration as a Special Edition of the Federal Register"
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Sources of radiation for the purposes of inspection of foods, for inspection of packaged food, and for controlling food processing may be safely used under the following conditions:
(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.
(ii)A statement that no food shall be exposed to radiation sources listed in paragraph (a) (1) and (2) of this section so as to receive an absorbed dose in excess of 10 grays.
(iii)A statement that no food shall be exposed to a radiation source listed in paragraph (a)(3) of this section so as to receive an absorbed dose in excess of 2 milligrays.
(iv)A statement that no food shall be exposed to a radiation source listed in paragraph (a)(4) of this section so as to receive a dose in excess of 0.5 gray (Gy).
(v)A statement that no food shall be exposed to a radiation source listed in paragraph (a)(5) of this section so as to receive a dose in excess of 0.01 gray (Gy).