Pleased answer these dont make the answer longer and please

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1.The heel effect is a variation of the intensity of X-rays emitted by the anode depending on the direction of emission.Due to the geometry of the anode,X-rays emitted towards the cathode are in general more intense than those emitted perpendicular to the cathode-anode axis.The effects stems from the absorption of X-ray photons before they leave the anode in which they are produced.The probability of absorption depends on the distance the photons travel within the anode material,which in turn depends on the direction of emission.Due to the anode heel effect,the x-ray beam is not uniform in the direction parallel to the anode-cathode axis of the x-ray tube.

2.A grid is used in mammography to absorb scattered radiation and improve contrast sensitivity.The grid is contained in a Bucky device that moves it during the x-ray exposure to blur and reduce the visibility of the grid lines.Scattered radiation can be reduced by a factor of three through the use of an appropriate grid.Moving grids are widely used and a mammographic unit should be equipped with a mechanism designed to move the grid during the x-ray exposure,in such a manner,that the grid septa are not visible on the mammographic image.