The Complete Lab Radiation Safety Checklist: 10 Must‑Do Steps Before Every Experiment

Every time I walk into a new experiment I feel a little thrill – the same feeling I got the first time I handled a Geiger counter in grad school. That excitement is great, but it can also blind us to the small things that keep a lab safe. A missed step can mean a contaminated glove, a confused student, or worse, an unnecessary dose. That’s why I swear by a short, solid checklist before I start any work with radioactivity. Below is the list I keep on my desk at Lab Radiology Insights, and I hope it helps you keep your own lab humming safely.

Why a checklist matters

Radiation safety is a lot like driving a car. You wouldn’t start the engine without checking the mirrors, seat belt, and fuel level. The same logic applies in the lab. A checklist forces you to pause, think, and verify that every protective measure is in place. It also creates a habit that sticks even when you’re tired or under pressure. Over the years I’ve seen a simple “Did you wear your badge?” question stop a potential over‑exposure before it even happened.

Step 1 – Verify your training record

Before you even touch a vial, make sure your training is up to date. This includes the specific isotope you’ll be using, the equipment, and the emergency procedures. If you’re a new student, ask your supervisor to sign off on the latest safety module. A quick glance at the training log can save a lot of trouble later.

Step 2 – Check the radiation work permit

Most institutions require a written permit for any work with radioactive material. The permit lists the isotope, activity, location, and duration. Confirm that the details match what you plan to do. If anything looks off, stop and get clarification. A mismatched permit is a red flag that the experiment may not have been approved properly.

Step 3 – Inspect personal protective equipment (PPE)

Grab your lab coat, gloves, safety glasses, and dosimeter badge. Make sure the coat is clean, the gloves are intact, and the badge is clipped to the front of your shirt. I once found a tiny tear in a glove after a week of use – a simple visual check would have caught it before I handled a high‑activity source.

Step 4 – Calibrate your detection instruments

Your Geiger‑Müller tube, scintillation counter, or survey meter must be calibrated within the last six months. Run a quick background check and then a known source test. If the reading is off, note it and inform the health physics office before proceeding. Trust me, a mis‑calibrated meter can give you a false sense of safety.

Step 5 – Review the experimental layout

Walk through the bench space where you’ll be working. Ensure that shielding (lead bricks, plexiglass shields) is in place, that the work area is clear of unnecessary items, and that the fume hood (if needed) is on. I once set up a reaction on a bench that was too close to a high‑traffic aisle – a simple layout review would have moved it to a safer spot.

Step 6 – Confirm source handling procedures

Know exactly how you will transfer, weigh, or pipette the radioactive material. Have the right tools ready: syringes, pipette tips, tongs, or tweezers that are rated for the activity level. Double‑check that you are using the correct containment (e.g., a sealed vial versus an open dish). Mistakes here are the most common cause of spills.

Step 7 – Prepare spill kits and emergency supplies

Every bench dealing with radioactivity should have a spill kit within arm’s reach. Verify that the kit contains absorbent pads, chelating agents, waste bags, and a copy of the emergency plan. Also check that the emergency phone number and the location of the nearest shower are posted clearly.

Step 8 – Perform a “dry run” of the workflow

Before you add any activity, walk through the steps mentally or with a non‑radioactive mock sample. This helps you spot awkward hand movements, unnecessary reaches, or steps that could be combined. I once saved a colleague from a near‑miss by noticing that the transfer tube was too long and would have swung into the detector.

Step 9 – Log the start time and expected end time

Record the exact time you begin work and an estimate of when you’ll finish. This information is useful for dosimetry calculations and for anyone who might need to enter the area later. If the experiment runs longer than expected, note the extension and reassess the exposure limits.

Step 10 – Conduct a final “go/no‑go” pause

Take a deep breath, look around, and ask yourself: “Do I have everything I need? Is the area secure? Have I followed all the steps above?” If the answer is yes, give yourself a mental green light and start. If anything feels off, pause and fix it. This tiny pause has prevented more than one accidental exposure in my career.

Following these ten steps may feel like a lot at first, but they quickly become second nature. The goal isn’t to add bureaucracy; it’s to give you confidence that you’re protecting yourself, your coworkers, and the environment. When you leave the lab at the end of the day, the only thing you should be worrying about is whether you remembered to turn off the coffee maker.

Stay safe, stay curious, and keep those badges clipped tight.