---
kind: "section"
citation: "21 C.F.R. § 579.22"
title: "21"
number: "579.22"
heading: "Ionizing radiation for treatment of animal diets."
url: "https://uscodex.org/cfr/21/579.22"
---

# §579.22. Ionizing radiation for treatment of animal diets.


Ionizing radiation for treatment of complete diets for animals may be safely used under the following conditions:

- (a) **Energy sources.** Ionizing radiation is limited to:
  - (1) **Gamma rays for sealed units of the radionuclides cobalt-60 or cesium-137.**
  - (2) **Electrons generated from machine sources at energy levels not to exceed 10 million electron volts.**
- (b) **Uses.**
  - (1) **The ionizing radiation is used or intended for use in single treatment as follows—**
  - (2) If an irradiated feed ingredient is less than 5 percent of the final product, the final product can be irradiated without being considered to be re-irradiated.

## Notes

### Amendments

[51 FR 5993, Feb. 19, 1986; 51 FR 8315, Mar. 11, 1986, as amended at 58 FR 18148, Apr. 8, 1993; 66 FR 18540, Apr. 10, 2001]

### Authority

Authority: 21 U.S.C. 321, 342, 343, 348, 371.

### Amendments

[51 FR 5993, Feb. 19, 1986; 51 FR 8315, Mar. 11, 1986, as amended at 58 FR 18148, Apr. 8, 1993; 66 FR 18540, Apr. 10, 2001]