# Table of activity limits—excepted quantities and articles.

**Citation:** 49 CFR 173.425  
**Type / status:** regulation / current  
**Agency:** Pipeline and Hazardous Materials Safety Administration  
**Effective:** 2026-08-18  
**Published:** Not stated

The limits applicable to instruments, articles, and limited quantities subject to exceptions under §§ 173.421 and 173.424 are set forth in table 4 as follows:

Table 4—Activity Limits for Limited Quantities, Instruments, and Articles Nature of contents Instruments and articles Limited quantity packa

## Document text

The limits applicable to instruments, articles, and limited quantities subject to exceptions under §§ 173.421 and 173.424 are set forth in table 4 as follows:

Table 4—Activity Limits for Limited Quantities, Instruments, and Articles Nature of contents Instruments and articles Limited quantity package limits 1 Limits for each instrument or article 1 Package limits 1 Solids: Special form 10−2 A1 A1 10−3 A1 Normal form 10−2 A2 A2 10−3 A2 Liquids: Tritiated water: <0.0037 TBq/L (0.1 Ci/L) 37 TBq (1,000 Ci) 0.0037 TBq to 0.037 TBq/L (0.1 Ci to 1.0 Ci/L) 3.7 TBq (100 Ci) >0.037 TBq/L (1.0 Ci/L) 0.037 TBq (1.0 Ci) Other Liquids 10−3 A2 10−1 A2 10−4 A2 Gases: Tritium 2 2 × 10−2 A2 2 × 10−1 A2 2 × 10−2 A2 Special form 10−3 A1 10−2 A1 10−3 A1 Normal form 10−3 A2 10−2 A2 10−3 A2 1 For mixtures of radionuclides see § 173.433(d). 2 These values also apply to tritium in activated luminous paint and tritium adsorbed on solid carriers.

[Amdt. 173-244, 60 FR 50307, Sept. 28, 1995, as amended by Amdt. 173-244, 61 FR 20751, May 8, 1996; 63 FR 52849, Oct. 1, 1998; 65 FR 58630, Sept. 29, 2000; 66 FR 45383, Aug. 28, 2001; 69 FR 3676, Jan. 26, 2004]

## Provenance

- Official: Yes
- Source: <https://www.ecfr.gov/on/2026-08-18/title-49/section-173.425>
- Source ID: `ecfr`
- SHA-256: `a7dc656ae6a497980d02dc3dfc8e04eeae79ea7b17d86320c285e96cedbcef32`
- Retrieved: 2026-08-20T05:46:04.092Z
- Exported: 2026-08-23T10:44:10.370Z
- Document slug: `49-cfr-173-425`

### Source metadata

```json
{
  "cfrTitle": 49,
  "part": "173",
  "section": "173.425",
  "subpart": "Subpart I—Class 7 (Radioactive) Materials",
  "corpusVersion": "2026-08-18",
  "jurisdiction": "US"
}
```