---
kind: "section"
citation: "49 C.F.R. § 173.431"
title: "49"
number: "173.431"
heading: "Activity limits for Type A and Type B packages."
url: "https://uscodex.org/cfr/49/173.431"
---

# §173.431. Activity limits for Type A and Type B packages.

- (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](/cfr/49/173.435.md), or, for Class 7 (radioactive) materials not listed in [§ 173.435](/cfr/49/173.435.md), as determined in accordance with [§ 173.433](/cfr/49/173.433.md).
- (b) The limits on activity contained in a Type B(U) or Type B(M) package are those prescribed in §§ [173.416](/cfr/49/173.416.md) and [173.417](/cfr/49/173.417.md), or in the applicable approval certificate under [§ 173.471](/cfr/49/173.471.md), [§ 173.472](/cfr/49/173.472.md) or [§ 173.473](/cfr/49/173.473.md).

## Notes

### Amendments

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

### Source

Source: Amdt. 173-244, 60 FR 50307, Sept. 28, 1995, unless otherwise noted.

### Authority

Authority: 49 U.S.C. 5101-5128, 44701; 49 CFR 1.81, 1.96 and 1.97.

### Amendments

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