Radiation safety and radiobiology mnemonic

Three ways to reduce radiation exposure

The mnemonic

TDS

What each word stands for

  • TTime: shorten exposure
  • DDistance: dose falls with the square of distance
  • SShielding: lead barriers and aprons

Why it matters clinically

The practical basis of ALARA for staff in X-ray and fluoroscopy rooms.

Where it stops being reliable

Does not give dose limits or the justification principle.

Teaching aid, still awaiting independent review. Confirm facts in a standard source.

More mnemonics

Common questions

What is the Radiation safety and radiobiology mnemonic?

TDS. It helps you recall: Three ways to reduce radiation exposure.

What does "T" stand for?

Time: shorten exposure

What does "D" stand for?

Distance: dose falls with the square of distance

What does "S" stand for?

Shielding: lead barriers and aprons

What are all the parts of the TDS mnemonic?

T: Time: shorten exposure; D: Distance: dose falls with the square of distance; S: Shielding: lead barriers and aprons.

Which topic does this mnemonic belong to?

It belongs to Radiation safety and radiobiology in Radiology.

Where does this mnemonic stop being reliable?

Does not give dose limits or the justification principle.

How is this useful clinically?

The practical basis of ALARA for staff in X-ray and fluoroscopy rooms.

How do I make this mnemonic stick?

Say it aloud, write it from memory tomorrow, then again in a week. Then test yourself on a Radiology question about Radiation safety and radiobiology.

Is this a standard mnemonic?

It is a teaching aid written or adapted by our team. Some resemble ones students share informally. Check any fact that matters in a standard source.