☣️ UN 3321 • CLASS 7
UN 3321 — Radioactive material, low specific activity (LSA-II), non fissile or fissile-excepted
Placard: Radioactive. ERG Guide 162. Training/quick-reference only — use current ERG + SOP/SOG for incident-specific actions.
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⚠️ Verification required:
Broad or variable material category; verify exact product, SDS and shipping papers.
⚠️ This page is a quick-reference aid. For real incidents: stage upwind, isolate, deny entry, request Hazmat early, and consult the current ERG + SOP/SOG.
UN 3321 is a Class 7 radioactive material entry. The main response priorities are life safety, package integrity, contamination control, radiation monitoring, and early notification of the radiation authority.
Hazard overview: Undamaged packages generally present low risk, but damaged packages or released contents may create external radiation or contamination hazards. Some radioactive materials may not be detectable with basic instruments.
Response guidance: Do not touch damaged packages or spilled material. Isolate the area, keep people upwind and away, use radiation survey instruments and dosimetry when available, and follow radiation authority direction.
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UN 3321 Quick Details
UN 3321
Product name: Radioactive material, low specific activity (LSA-II), non fissile or fissile-excepted
DOT Class: 7
Placard type: Radioactive
ERG Guide: 162 (check current ERG)
Initial isolation: ERG 162: isolate spill/leak area immediate precautions 25m in all directions; for large spills increase isolation 80m; do not touch damaged packages or spilled material
Common Hazards of UN 3321
- Radiation presents minimal risk to transport workers, emergency response personnel and the public
- Undamaged packages are safe. Contents of damaged packages may cause higher external radiation
- Low radiation hazard when material is inside container. If material is released from package or bulk
- Some material may be released from packages during accidents of moderate severity but risks to people
- Released radioactive materials or contaminated objects usually will be visible if packaging fails.
- Some exclusive use shipments of bulk and packaged materials will not have RADIOACTIVE labels.
- Some packages may have a RADIOACTIVE label and a second hazard label. The second hazard is usually
- Some radioactive materials cannot be detected by commonly available instruments.
Chemical Identity & Physical Properties
Variable physical form including solids, liquids, or gases with low specific activity radioactivity. Material may be ores, mill tailings, contaminated equipment, or activated materials with activity concentration meeting LSA-II criteria.
| Also known as | LSA-II radioactive materialLow specific activity material class IINon-fissile radioactive material LSA-IIRadioactive LSA-2 |
| Appearance | Variable physical form including solids, liquids, or gases with low specific activity radioactivity. Material may be ores, mill tailings, contaminated equipment, or activated materials with activity concentration meeting LSA-II criteria. |
| Flash Point | Not applicable (radioactive material classification based on activity, not flammability) |
| Boiling Point | Not applicable (varies by specific material composition) |
| Vapor Density | Not applicable (varies by specific material form and composition) |
| Water Reactivity | Generally no significant reaction; depends on specific material composition |
Chemical details are general reference only. Always verify with current SDS, ERG, and SOP/SOG.
Fireground Response Guidance — UN 3321
Extinguishing Media
Water spray, foam acceptable for fire control; focus on radiation containment over fire suppression method
PPE Requirements
⚠️ Radiation monitoring equipment required; protective clothing to prevent contamination; respiratory protection if airborne contamination possible; dosimetry badges mandatory
Radiation monitoring equipment required; protective clothing to prevent contamination; respiratory protection if airborne contamination possible; dosimetry badges mandatory
Isolation & Evacuation
ERG 162: isolate spill/leak area immediate precautions 25m in all directions; for large spills increase isolation 80m; do not touch damaged packages or spilled material
Always confirm protective actions with the current edition of the Emergency Response Guidebook (ERG Guide 162).
First Actions for a UN 3321 Incident
- CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper not
- Priorities for rescue, life-saving, first aid, fire control and other hazards are higher than the priority
- Radiation Authority must be notified of accident conditions. Radiation Authority is usually responsible for
- Stay upwind, uphill and/or upstream.
- Keep unauthorized personnel away.
- Detain or isolate uninjured persons or equipment suspected to be contaminated; delay decontamination and
- Isolate spill or leak area for at least 25 meters (75 feet) in all directions.
- Consider initial downwind evacuation for at least 100 meters (330 feet).
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📋 Copy & Share Field Card
UN 3321 — Radioactive material, low specific activHAZMAT RADIO NOTE — UN 3321
Product: Radioactive material, low specific activity (LSA-II), non fissile or fissile-excepted
Class 7 / Radioactive / ERG 162
PPE: Radiation monitoring equipment required; protective clothing to prevent contamination; respiratory protection if airborne contamination possible; dosimetry badges mandatory
ISOLATION: ERG 162: isolate spill/leak area immediate precautions 25m in all directions; for large spills increase isolation 80m; do not touch damaged packages or spilled material
ACTION: Stage upwind · Isolate · Deny entry · Request HazmatRADIO
Use for: Quick radio or face-to-face size-up. Short, structured, field-ready.
=== IC HAZMAT BRIEFING ===
UN 3321 — Radioactive material, low specific activity (LSA-II), non fissile or fissile-excepted
Class: 7 | Placard: Radioactive | ERG Guide: 162
Appearance: Variable physical form including solids, liquids, or gases with low specific activity radioactivity. Material may be ores, mill tailings, contaminated equipment, or activated materials with activity concentration meeting LSA-II criteria.
Water Reactivity: Generally no significant reaction; depends on specific material composition
Extinguishing: Water spray, foam acceptable for fire control; focus on radiation containment over fire suppression method
PPE: Radiation monitoring equipment required; protective clothing to prevent contamination; respiratory protection if airborne contamination possible; dosimetry badges mandatory
Isolation: ERG 162: isolate spill/leak area immediate precautions 25m in all directions; for large spills increase isolation 80m; do not touch damaged packages or spilled material
— Key Hazards —
• Radiation presents minimal risk to transport workers, emergency response personnel and the public
• Undamaged packages are safe. Contents of damaged packages may cause higher external radiation
• Low radiation hazard when material is inside container. If material is released from package or bulk
— First Actions —
• CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper not
• Priorities for rescue, life-saving, first aid, fire control and other hazards are higher than the priority
• Radiation Authority must be notified of accident conditions. Radiation Authority is usually responsible for
• Stay upwind, uphill and/or upstream.
SOURCE: allfirefighter.com/hazmat/un/radioactive-material-low-specific-un-3321 | Always use current ERG + SOP/SOGIC BRIEFING
Use for: Incident command briefing, staging area whiteboard, or pre-entry team brief.
UN3321 Radioactive material, low specific activity (LSA-II), non fissile or fissile-excepted Cls7 ERG162 | allfirefighter.com/hazmat/un/radioactive-material-low-specific-un-3321SMS / 160 CHAR
Use for: Quick text to command or incoming units. Fits in a single SMS.
⚠️ Quick-reference only. Always use current ERG + SOP/SOG for incident-specific actions.
Page: https://allfirefighter.com/hazmat/un/radioactive-material-low-specific-un-3321
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Frequently Asked Questions about UN 3321
Yes. It is a Class 7 radioactive material entry.
Undamaged packages normally present low external risk, but labels and radiation readings should still be checked.
Isolate the area, avoid contact, monitor radiation if equipped, and notify the radiation authority.
Use protective clothing to prevent contamination, respiratory protection if airborne contamination is possible, and dosimetry for responders.
Minimize time, maximize distance, and use shielding whenever practical.
Sources (high level): DOT/PHMSA marking & class concepts + ERG usage principles.
This page does not reproduce ERG guide text—always consult the current ERG for incident-specific protective actions.