<prompt> According to Heel effect:High intensity x-rays are found at cathode.Low intensity x-rays are found at anode.Both of the above.None.  <response>: According to Heel effect, when cathode rays strike anode target, X-rays with high intensity are found towards cathode side of central ray and X-rays with low intensity are found towards anode. This is due to self absorption of photons in the anode target. 