Nichiyu Giken Kogyo Co., Ltd.

Hitoshi Shirase

Yoshiaki Kaburaki

Daisuke Harumoto

Hiromichi Mizusawa

Yukiyo Niwa

Yoshiaki c/o Inform Media Division Kaburaki

A temperature management indictor having simple structure is provided, which, not containing a hazardous metal, especially mercury among others, is safe and excellently durable, especially durable against light and repetition of heating and cooling cycle, is capable of indicating specific temperature ranges by means of reversible color changes, and also is able, as need be, to indicate an arrival at a specific temperature by means of an irreversible color change. A temperature management indicatorcomprises; a reversible temperature indicating memberincluding reversible temperature indicating pigment particles devoid of mercury, which reversibly undergoes color changes at a predetermined temperature, wherein in the reversible temperature indicating member, the reversible temperature indicating pigment particles contain an iron-containing complex compound and are dispensed to be dispersed in a resin thereof.

Temperature management indicator and structure having the same attached

The present composition for use in radiation exposure dose-history indicators comprises a radioactive ray-absorber and/or a radioactive ray-excited fluorescence-emitting agent, a color-developing and electron-donating organic compound and an active species-generating organic compound, which can initiate the color development of the electron-donating organic compound through the application of radioactive rays. The indicator sheet for indicating the radiation exposure dose-history comprises a matrix sheet; and a color-developing layer, which contains a color-developing and electron-donating organic compound, an active species-generating organic compound, which can initiate the color development of the electron-donating organic compound through the application of radioactive rays, and a radioactive ray-absorber and/or a radioactive ray-excited fluorescence-emitting agent and which is applied to at least part of the surface of the matrix sheet.

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Kawagoe, Japan

Hitoshi Shirase