Member for activating substance back ground

A structure for activating a substance, comprising:

• a metal layer containing a metal with a redox potential 0V or less or an alloy of a metal with a redox potential 0V or less having a redox potential 0V or less in a form of a plate or a foil;
• and
• a radiation generating layer containing a mixture of a natural ore containing a radioactive substance with a radiolucent resin and a powder of metal with a redox potential of from −1.5V or more to 0V or less or a powder of alloy of a metal with a redox potential of from −1.5V or more to 0V or less having a redox potential of from −1.5V or more to 0V or less,
• wherein the mixture does not substantially contain a powder of metal with a redox potential of less than −1.5V nor a powder of alloy of a metal with a redox potential of less than −1.5V having a redox potential of less than −1.5V,
• wherein the dose of radiation generated from the radiation generating layer is from 0.02 μSv/h or more to 0.2 μSv/h or less, and
• wherein the metal layer and the radiation generating layer are disposed in a form of a plate or a foil.

A composition for forming a radiation generating layer, comprising:

• a natural ore containing a radioactive substance;
• a powder of metal with a redox potential of from −1.5V or more to 0V or less or a powder of alloy of a metal with a redox potential of from −1.5V or more to 0V or less having a redox potential of from −1.5V or more to 0V or less;
• and
• a radiolucent resin,
• wherein the composition does not substantially contain a powder of metal with a redox potential of less than −1.5V nor a powder of alloy of a metal with a redox potential of less than −1.5V having a redox potential of less than −1.5V, and
• wherein the dose of radiation generated from the radiation generating layer is from 0.02 μSv/h or more to 0.2 μSv/h or less.