Daily Five
A small, balanced round for regular recall. Revisit the explanation after every decision, then return to the questions that need another look.
What you will practise
- Recall core facts across the specialty.
- Connect an answer to its explanation.
- Build a repeatable review routine.
Set up your round
118 questions available
A smaller pool gives a shorter round. In timed mode, the clock sets the round length. Prompt length is a study preference, not a validated difficulty rating.
Before you begin
Open an example to revisit its answer and reasoning.
Principal photon energy used to image ⁹⁹ᵐTc?
Answer
140 keV
Reasoning⁹⁹ᵐTc emits a 140 keV γ — ideal for the gamma camera.
PET imaging detects…
Answer
Two 511 keV photons ~180° apart
ReasoningPositron–electron annihilation → two 511 keV photons in coincidence.
Physical half-life of ¹⁸F?
Answer
~110 minutes
Reasoning¹⁸F T½ ≈ 110 min.