THMG517 – DOT Class 7

The HazMat Guys: Archives

THMG517 – DOT Class 7 | Part II

October 10, 2025

In this episode, we thought we would smash this all into one episode, but it turned out to be two. In this one, we're going through DOT Class 7, which covers radioactives. Radioactives involve a lot of information. So dig in with us and enjoy.

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Episode Overview:

In this second part of Class 7 on DOT placards and radiological incidents, the hosts delve deep into the operational, logistical, and strategic complexities of responding to radiological emergencies. With humor and clarity, they walk listeners through everything from contamination control and decon procedures to equipment specifics, public communication, and the legal importance of accurate documentation. Whether you're a hazmat tech, first responder, or radiation nerd, this episode is packed with hands-on advice and insider stories that make complex concepts both relatable and memorable.

Segment Breakdown & Timestamps:

00:00 – 04:42 | Episode Intro & Format Talk

Discussion on the unexpected depth of the DOT placard series and teasing future episode expansions.

04:43 – 06:08 | Decon and Contamination Control Begins

RAD materials: solid, liquid, or gas? Differences in form based on industry vs. medical usage.

06:09 – 09:46 | Dust, Zones, and Cross-Contamination

Gear removal techniques, zoning for PPE and victims, CST support, and early notification protocols.

09:47 – 13:10 | ALARA and Dosimetry Insights

Why every responder needs personal dosimetry, and debunking the "one badge per team" myth.

13:11 – 14:13 | Public Communication & PIO Importance

Managing public perception of radiation with accurate, authoritative messaging.

16:39 – 19:06 | Operational Sequence Part 1: Recon