A sunlight exposure indicator device is disclosed that can determine the amount of time (e.g., hours) of PAR sunlight that occurs in a specific area for the optimal growth of a plant, as corresponds to the plant industry common designations of Full Shade, Partial Shade, Partial Sun and Full Sun. These designations can be used to determine plant selection for all types of plants including grasses, shrubs, flowers, vegetables and herbs, and trees. This device utilizes irreversible, slow-reacting, photochromic pigments applied to a substrate. Using multiple instances of this device will allow someone to easily test and accurately determine the amount of PAR sunlight (hours) received during a one-day sunlight cycle in multiple spots simultaneously. The sunlight exposure indicator device is a one-time-use, non-electronic, disposable device.

A sunlight exposure indicator device is disclosed that can determine the amount of time (e.g., hours) of PAR sunlight that occurs in a specific area for the optimal growth of a plant, as corresponds to the plant industry common designations of Full Shade, Partial Shade, Partial Sun and Full Sun. These designations can be used to determine plant selection for all types of plants including grasses, shrubs, flowers, vegetables and herbs, and trees. This device utilizes irreversible, slow-reacting, photochromic pigments applied to a substrate. Using multiple instances of this device will allow someone to easily test and accurately determine the amount of PAR sunlight (hours) received during a one-day sunlight cycle in multiple spots simultaneously. The sunlight exposure indicator device is a one-time-use, non-electronic, disposable device.

A system is provided for determining personal ultra-violet (UV) radiation measurements, comprising: a measurement device configured to measure UV irradiation; and a terminal device configured to receive or capture an output of the measured UV irradiation from the measurement device and to determine a specific user's personal UV exposure risk level based on at least the measured sun irradiation and information of a skin type of the specific user. The measurement device configured to measure UV radiation exposure includes a surface that includes a plurality of different sections that each have a different sensitivity to UV radiation exposure, and each of the plurality of different sections are configured to display a different color in response to the UV radiation exposure.

A system is provided for determining personal ultra-violet (UV) radiation measurements, comprising: a measurement device configured to measure UV irradiation; and a terminal device configured to receive or capture an output of the measured UV irradiation from the measurement device and to determine a specific user's personal UV exposure risk level based on at least the measured sun irradiation and information of a skin type of the specific user. The measurement device configured to measure UV radiation exposure includes a surface that includes a plurality of different sections that each have a different sensitivity to UV radiation exposure, and each of the plurality of different sections are configured to display a different color in response to the UV radiation exposure.

Provided an ultraviolet-sensing sheet that facilitates measurement of ultraviolet irradiance over a wide area, that is suitable in ultraviolet irradiance in a range from 1 to 1,000 mJ/cm.sup.2, a method for manufacturing such an ultraviolet-sensing sheet, and a method for sensing ultraviolet. The ultraviolet-sensing sheet has a change in reflection density D1 of 0.2 or more over a range of cumulative illuminance 1 mJ/cm.sup.2 or more and less than 10 mJ/cm.sup.2, a change in reflection density D2 of 0.2 or more over a range of cumulative illuminance 10 mJ/cm.sup.2 or more and less than 100 mJ/cm.sup.2, and a change in reflection density D3 of 0.2 or more over a range of cumulative illuminance 100 mJ/cm.sup.2 or more and 1,000 mJ/cm.sup.2 or less, as measured at a wavelength of 365 nm when the ultraviolet-sensing sheet is irradiated with a high-pressure mercury lamp.

Provided an ultraviolet-sensing sheet that facilitates measurement of ultraviolet irradiance over a wide area, that is suitable in ultraviolet irradiance in a range from 1 to 1,000 mJ/cm.sup.2, a method for manufacturing such an ultraviolet-sensing sheet, and a method for sensing ultraviolet. The ultraviolet-sensing sheet has a change in reflection density D1 of 0.2 or more over a range of cumulative illuminance 1 mJ/cm.sup.2 or more and less than 10 mJ/cm.sup.2, a change in reflection density D2 of 0.2 or more over a range of cumulative illuminance 10 mJ/cm.sup.2 or more and less than 100 mJ/cm.sup.2, and a change in reflection density D3 of 0.2 or more over a range of cumulative illuminance 100 mJ/cm.sup.2 or more and 1,000 mJ/cm.sup.2 or less, as measured at a wavelength of 365 nm when the ultraviolet-sensing sheet is irradiated with a high-pressure mercury lamp.

Provided is a method and an apparatus for indicating minimum exposure of a surface to UVC light emitted by a source during a decontamination process to achieve a desired level of pathogen reduction. The apparatus includes a photochromic material to be applied to, or applied adjacent to the surface. The photochromic material is to exhibit a visible response to receiving the minimum exposure to the UVC light, and exhibit the visible response to a lesser extent after the photochromic material ceases to be exposed to the UVC light emitted by the source. A protective layer of material that is substantially transparent to the UVC light emitted by the source is positioned over the photochromic material to be disposed between the source and the photochromic material during the decontamination process.

Provided is a calibration member for calibration of an image of a color forming member, which forms a color with density distribution corresponding to an amount of energy applied thereto, in a captured image obtained by imaging the color forming member by an imaging device, the calibration member including a support that includes a first region on which the color forming member is placed and a second region on which a calibration image for calibration of the image of the color forming member is disposed and a transparent member that covers the color forming member placed on the first region of the support and of which a surface that serves as an imaging target surface in a case where the color forming member is to be imaged has a low gloss.

A device for measuring or detecting UV radiation that is usable with sunscreen, the device including: (a) a colorant layer having at least one photochromic material that is capable of changing its color when exposed to UV radiation, and (b) an over-layer atop the colorant layer having (i) a bottom surface that is in contact with a top surface of the colorant layer and (ii) an opposing top surface, the over-layer having a material that is constructed and arranged to allow at least a portion of the sunscreen, when deposited on the top surface of the over-layer, to be absorbed by the over-layer while preventing the sunscreen so deposited from penetrating through the over-layer to the colorant layer, the over-layer being transparent to allow UV radiation to pass through the over-layer to the colorant layer at least when the surface of the over-layer is not covered with the sunscreen. Also, methods for preparing and using the device.

A device for measuring or detecting UV radiation that is usable with sunscreen, the device including: (a) a colorant layer having at least one photochromic material that is capable of changing its color when exposed to UV radiation, and (b) an over-layer atop the colorant layer having (i) a bottom surface that is in contact with a top surface of the colorant layer and (ii) an opposing top surface, the over-layer having a material that is constructed and arranged to allow at least a portion of the sunscreen, when deposited on the top surface of the over-layer, to be absorbed by the over-layer while preventing the sunscreen so deposited from penetrating through the over-layer to the colorant layer, the over-layer being transparent to allow UV radiation to pass through the over-layer to the colorant layer at least when the surface of the over-layer is not covered with the sunscreen. Also, methods for preparing and using the device.