# Radioactive instruments and articles (UN2911) — clocks, electronic tubes — Postal shipping restrictions by item category

For Radioactive instruments and articles (UN2911), item category is Radioactive instruments and articles (UN2911) — clocks, electronic tubes; carrier is USPS; restriction type is restricted; scope is domestic mail via surface transportation; conditions is Mailable if activity does not exceed limits in Exhibit 347.22; classified as excepted package for simplified handling per 49 CFR 172.101; must follow Packaging Instruction 7A, recorded from its source on 2026-08-04.

- **Item category:** Radioactive instruments and articles (UN2911) — clocks, electronic tubes
- **Carrier:** USPS _(our reading, not quoted from the source)_
- **Restriction type:** restricted _(our reading, not quoted from the source)_
- **Scope:** domestic mail via surface transportation _(our reading, not quoted from the source)_
- **Conditions:** Mailable if activity does not exceed limits in Exhibit 347.22; classified as excepted package for simplified handling per 49 CFR 172.101; must follow Packaging Instruction 7A _(unconfirmed — we could not tie this to the quote below)_

## What the source says

> UN2911: Low-risk items like clocks, electronic tubes, or similar devices with radioactive materials in gas or solid form, classified as "excepted package" for simplified handling under 49 CFR § 172.101.

## Source

- https://pe.usps.com/text/pub52/pub52c3_026.htm

Last verified: 2026-08-04. Review by: 2027-08-04.
Part of [Postal shipping restrictions by item category](https://referencesource.org/shipping-restrictions-by-class/).