Anyone who has spent time in a radiography department has asked some version of this question. A small marker sits directly in the primary beam, right next to the anatomy being imaged, and somehow it does not ruin the picture. So how does that actually work?
I get asked this by students and where to place the xray markers is something in clinical we focus on a lot.
Where the Xray Marker Sits on a Plate?
The marker is placed directly on the imaging plate or detector before the exposure is taken. It is positioned in the primary beam intentionally. That is not a mistake or something to be avoided. The marker is meant to be exposed along with the anatomy.
What matters is placement. A marker in the primary beam does not obscure anatomy as long as it is placed correctly, away from the structures the radiologist actually needs to see. This is a skill that comes with repetition and attention, not something you can shortcut.
Why Plate Placement Alone Isn’t Enough
Getting the marker into the beam is only half the job. The other half is making sure it stays exactly where you put it until the exposure is taken. That is where tape comes in.
Radiographers use tape to secure the marker to the imaging plate or receptor so it does not shift during positioning, patient movement, or when the plate is being handled. Without that, you could place a marker perfectly and still end up with it drifting out of position before the beam ever fires.
Tape Xray Markers correctly on the Plate
In an ideal world, markers are secured with higher grade tape or Radhesive, a purpose-built adhesive designed for this exact job. In practice, most technologists reach for regular tape instead. There is a practical reason for that.
Regular tape is disposable. In isolation cases, where infection control is a priority, techs need to be able to throw the tape away and disinfect the marker itself before it is used again. Being able to discard the adhesive quickly, without worrying about cleaning it, makes regular tape the practical choice in a lot of clinical settings, even if it is not the premium option.
The Detail Most People Miss: Tape Shows Up Too
Here is something that does not get talked about enough. Tape can be visible on soft tissue. On certain exposures, especially where soft tissue detail matters, the tape holding the marker in place can show up as its own artifact on the image.
This is exactly why marker placement and tape choice cannot be an afterthought. Techs and students need to be deliberate about both where the marker goes and what they are using to hold it there, because either one done carelessly can end up on the final image.
What We Look For at XrayMarkers.ca
At this point, we do not sell tape through XrayMarkers.ca. What we focus on is markers that can be cleaned and disinfected, so they hold up to the realities of infection control in a busy department without needing to be replaced constantly.
That distinction matters. A marker that cannot stand up to disinfection becomes a liability in isolation cases and anywhere infection control protocols are strict. Durability and the ability to properly disinfect a marker between uses should be non-negotiable, regardless of which tape a department chooses to pair it with.
Why This Small Detail Actually Matters
It is easy to treat marker placement and adhesion as a minor technical detail, something you learn once in school and stop thinking about. In my experience, that is a mistake.
Radiographers image patients in multiple positions, erect and supine, and the marker has to be on the correct side and in the correct orientation every single time. Get that wrong, and you are not just dealing with a cosmetic issue. You are dealing with a marker that no longer accurately represents the patient’s anatomy or positioning, which can affect diagnosis and patient care.
The tape and the marker work together. Neither one matters in isolation. A well-placed marker secured with the wrong tape, or the right tape holding a marker in the wrong spot, can both create problems. Getting both right, consistently, is a skill that deserves more attention than it usually gets.