# Activity limits for Type A and Type B packages.

**Citation:** 49 CFR 173.431  
**Type / status:** regulation / current  
**Agency:** Pipeline and Hazardous Materials Safety Administration  
**Effective:** 2026-08-18  
**Published:** Not stated

(a) Except for LSA material and SCO, a Type A package may not contain a quantity of Class 7 (radioactive) materials greater than A1 for special form Class 7 (radioactive) material or A2 for normal form Class 7 (radioactive) material as listed in § 173.435, or, for Class 7 (radioactive) materials not

## Document text

(a) Except for LSA material and SCO, a Type A package may not contain a quantity of Class 7 (radioactive) materials greater than A1 for special form Class 7 (radioactive) material or A2 for normal form Class 7 (radioactive) material as listed in § 173.435, or, for Class 7 (radioactive) materials not listed in § 173.435, as determined in accordance with § 173.433.

(b) The limits on activity contained in a Type B(U) or Type B(M) package are those prescribed in §§ 173.416 and 173.417, or in the applicable approval certificate under § 173.471, § 173.472 or § 173.473.

[Amdt. 173-244, 60 FR 50307, Sept. 28, 1995, as amended at 69 FR 3677, Jan. 26, 2004]

## Provenance

- Official: Yes
- Source: <https://www.ecfr.gov/on/2026-08-18/title-49/section-173.431>
- Source ID: `ecfr`
- SHA-256: `8303270429cc07527ffdb25af9b954305733e0d8a4934d1733d34972f284bc27`
- Retrieved: 2026-08-20T05:46:04.092Z
- Exported: 2026-08-23T10:42:24.616Z
- Document slug: `49-cfr-173-431`

### Source metadata

```json
{
  "cfrTitle": 49,
  "part": "173",
  "section": "173.431",
  "subpart": "Subpart I—Class 7 (Radioactive) Materials",
  "corpusVersion": "2026-08-18",
  "jurisdiction": "US"
}
```