Class 7 Radioactive Label vs Radioactive Yellow Labels: How Labels Differ By Packaging And Activity

Class 7 Radioactive Label A dangerous-goods hazard label used to communicate the transport hazard classification represented by 'Class 7 Radioactive Label'.

Understanding the difference between the generic Class 7 label and the specific "Radioactive Yellow" label variants is essential when preparing packages with radiation sources. Both communicate radiation risk, but each variant corresponds to particular activity ranges, transport indices and handling rules. This article explains how visual variants tie to packaging types and why shippers must select the correct label rather than relying on a single generic sticker.

Label Variants And What They Indicate

Regulators use label variants to provide quick visual cues about the level of radioactivity and potential exposure at the package surface and at one meter. The most common variants are the white-I, yellow-II and yellow-III labels—often referred to by transport professionals as Radioactive White, Radioactive Yellow II and Radioactive Yellow III.

• White-I (Low Radiation): Indicates very low radiation levels; no transport index (TI) is displayed. It's used for low-activity packages that meet stringent limits.
• Yellow-II (Moderate Radiation): Used when radiation at the surface exceeds the White-I threshold but remains below the Yellow-III upper boundary. A transport index may be required.
• Yellow-III (Higher Radiation): Applied to packages with higher surface dose rates; the transport index must be shown and carriers apply stricter segregation and loading rules.

How The Labels Relate To Activity And Transport Index

Activity (in becquerels or curies) and the package design determine the label variant. The transport index (TI) quantifies the radiation level at one meter from the package and guides segregation and stowage limits in vehicles and ship compartments.

• Activity Limits: Packaging specifications set maximum permitted activities for each packaging type; once activity exceeds certain thresholds, the label must move from White-I to Yellow-II or Yellow-III.
• Transport Index: TI values are calculated and recorded on the package; higher TI typically triggers Yellow-III and stricter transport controls.

Operational Consequences Between Label Types

Label choice affects how carriers handle and route shipments. In practical terms, a Yellow-III package may require dedicated vehicle space, driver notification, different loading positions and stronger documentation compared with a White-I package.

• Segregation: Yellow-III packages may need greater separation from other cargo and people during loading and transit.
• Placarding vs Labeling: For larger consignments, vehicle placards (larger signs on trucks) may be required in addition to package labels; label variant informs placard decisions.
• Notification Requirements: Some carriers require advance notice or special handling instructions for Yellow-II and Yellow-III consignments.

Modal Differences: Air, Sea, Road

While IAEA guidance provides the global basis, modal codes overlay additional constraints. Air transport often has the most restrictive activity limits and may restrict Yellow-III shipments entirely for certain sources or require specific packaging.

• Air: Check IATA DGR for whether a particular label variant and package type are permitted; small diagnostic radiopharmaceuticals may be allowed under limited conditions while larger sources are not.
• Sea: The IMDG Code accepts yellow labels but enforces stowage and segregation standards for higher TI packages.
• Road/Rail: National rules such as 49 CFR implement the IAEA framework and specify placarding, emergency response and documentation obligations tied to packagings and label type.

Choosing The Correct Label: Shipper Checklist

Use a decision checklist to ensure the correct label variant is applied. Mistaking Yellow-II for Yellow-III, or omitting the TI, is a frequent source of noncompliance.

• Confirm Activity: Use the source certificate and packaging certificate to confirm activity and allowed packaging limits.
• Calculate TI: Compute the transport index per regulatory guidance and print it on the package marking where required.
• Match Mode Rules: Verify the intended transport mode accepts the package type and label variant; obtain necessary approvals for restricted shipments.
• Inspect Labels: Ensure labels are legible, durable and placed on contrasting backgrounds so the trefoil and class number are visible.

Example Scenario: Diagnostic Isotope vs Industrial Source

A small vial of a diagnostic isotope may qualify for a White-I label when packaged appropriately and under activity thresholds. An industrial radiography source, containing a much higher activity, will typically be Yellow-III and carry a TI value—leading to more rigorous handling, vehicle load plans and documentation requirements.

In short, the Class 7 Radioactive Label is a general hazard-class identifier; the Radioactive White/Yellow variants (I, II, III) communicate specific surface dose and transport-index information that determine handling, segregation and modal acceptability. Always verify activity, packaging certificates and modal regulations before selecting and applying a label.