Abstract: A gradation thermal printhead having a plurality of heat generating elements each having a heat generating body connected between a pair of electrodes, the electric resistance value of the heat generating body being locally increased in one or more portions thereof. Disclosed also is a gradation heat transfer printing apparatus making use of the gradation thermal printhead mentioned above and employing an energy controlling means for varying the voltage or pulse width of the signal pulse voltage applied to the thermal printhead, thereby allowing a control of the area of the printed dot corresponding to one heat generating element, i.e., the density of printing, thus attaining a gradation control of the printed image.

Abstract: A thermoluminescence dosimeter element including an adhesive coating formed in a predetermined thickness on a base tape, and particles of thermoluminescent material sprayed onto the surface of the adhesive coating. Such thermoluminescence dosimeter element is produced by a method including a first step of spreading into an adhesive coating of a small thickness an adhesive agent applied in drops to the surface of a base tape, a second step of spraying particles of thermoluminescent material onto the surface of the adhesive coating through one of openings formed in a masking tape operatively brought into contact with the base tape, and a third step of drying the adhesive coating to ensure that the particles of the thermoluminescent material firmly adhere to the base plate. The method enables thermoluminescence dosimeter elements of high sensitivity and reliable performance to be produced continuously on a mass production basis.