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49 CFR § 173.425 - Table of activity limits—excepted quantities and articles. 

---
identifier: "/us/cfr/t49/s173.425"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "49 CFR § 173.425 - Table of activity limits—excepted quantities and articles."
title_number: 49
title_name: "Transportation"
section_number: "173.425"
section_name: "Table of activity limits—excepted quantities and articles."
chapter_name: "PIPELINE AND HAZARDOUS MATERIALS SAFETY ADMINISTRATION, DEPARTMENT OF TRANSPORTATION"
subchapter_number: "C"
subchapter_name: "HAZARDOUS MATERIALS REGULATIONS"
part_number: "173"
part_name: "SHIPPERS—GENERAL REQUIREMENTS FOR SHIPMENTS AND PACKAGINGS"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "49 U.S.C. 5101-5128, 44701; 49 CFR 1.81, 1.96 and 1.97."
cfr_part: "173"
---

# 173.425 Table of activity limits—excepted quantities and articles.

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

|  |  |  |  |
| --- | --- | --- | --- |
| Solids: |  |  |  |
| Special form | 10 A | A | 10 A |
| Normal form | 10 A | A | 10 A |
| 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 A | 10 A | 10 A |
| Gases: |  |  |  |
| Tritium | 2 × 10 A | 2 × 10 A | 2 × 10 A |
| Special form | 10 A | 10 A | 10 A |
| Normal form | 10 A | 10 A | 10 A |
| For mixtures of radionuclides see § 173.433(d). |  |  |  |
| 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]