Heat sink for miniature x-ray unit

A miniaturized heat exchanger comprising;

• a metal collector having a top face and a bottom face;
• a first metal layer adjacent the top face of said collector;
• a second metal layer adjacent said first metal layer,
• the first and second metal layers having a channel therethrough for circulating a heat exchange fluid, the channel having an infeed and exit end through which the fluid may enter and leave the channel.

A method for preparing a miniaturized heat exchanger comprising;

• providing a metal collector layer;
• providing a first metal layer on a top face of said metal collector layer;
• providing an insulating layer on top of said metal collector layer;
• providing a photoresist layer on top of said insulating layer,
• imaging the photoresist layer to form imaged and non-imaged areas, either of said imaged or non-imaged areas defining a desired channel pattern;
• removing either the imaged or non-imaged areas to form cavities corresponding to the desired channel pattern;
• removing the insulating areas exposed by removal of imaged or non-imaged photoresist layer to form a pattern corresponding to the desired channel pattern;
• removing the remaining imaged or non-imaged photoresist;
• providing a second metal layer on top of the insulating layer and filling the corresponding channel layer formed by the insulating layer;
• and
• removing the remaining insulating layer to form the channel and the heat exchanger, the channel having an infeed end and an exit end accessible to the external environment.