We don't have synonyms for heel effect yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are hall effect.
(N) :
In X-ray tubes, the heel effect or, more precisely, the anode heel effect is a variation of the intensity of X-rays emitted by the anode depending on the direction of emission along the anode-cathode axis.
(N) :
In X-ray tubes, the heel effect or, more precisely, the anode heel effect is a variation of the intensity of X-rays emitted by the anode depending on the direction of emission along the anode-cathode axis.