---
kind: "section"
citation: "46 C.F.R. § 148.300"
title: "46"
number: "148.300"
heading: "Radioactive materials."
url: "https://uscodex.org/cfr/46/148.300"
---

# §148.300. Radioactive materials.

- (a) Radioactive materials that may be stowed or transported in bulk are limited to those radioactive materials defined in [49 CFR 173.403](/cfr/49/173.403.md) as Low Specific Activity Material, LSA-1, or Surface Contaminated Object, SCO-1.
- (b) Skin contact, inhalation or ingestion of dusts generated by Class 7 material listed in Table 148.10 of this part must be minimized.
- (c) Each hold used for the transportation of Class 7 material (radioactive) listed in Table 148.10 of this part must be surveyed after the completion of off-loading by a qualified person using appropriate radiation detection instruments. Such holds must not be used for the transportation of any other material until the non-fixed contamination on any surface, when averaged over an area of 300 cm 2, does not exceed the following levels:
  - (1) 4.0 Bq/cm 2 (10−4 uCi/cm 2;) for beta and gamma emitters and low toxicity alpha emitters, natural uranium, natural thorium, uranium-235, uranium-238, thorium-232, thorium-228 and thorium-230 when contained in ores or physical or chemical concentrates, and radionuclides with a half-life of less than 10 days; and
  - (2) 0.4 Bq/cm 2 (10−5 uCi/cm 2) for all other alpha emitters.

## Notes

### Authority

Authority: 33 U.S.C. 1602; E.O. 12234, 45 FR 58801, 3 CFR, 1980 Comp., p. 277; 46 U.S.C. 3306, 5111; 49 U.S.C. 5103; Department of Homeland Security Delegation No. 0170.1.

### Source

Source: 75 FR 64591, Oct. 19, 2010, unless otherwise noted.