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Related Concept Videos

UV–Vis Spectrometers01:14

UV–Vis Spectrometers

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The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell.
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Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview01:02

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Ultraviolet–visible (UV–visible or UV–Vis) spectroscopy is an analytical technique that investigates the interaction between matter and UV–Vis light within the electromagnetic spectrum. This method is widely used for its versatility, simplicity, and relatively quick data acquisition, making it valuable for both qualitative and quantitative analysis. When UV–Vis radiation passes through a material,  molecules absorb light depending on the energy required for...
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UV–Vis Spectrum01:30

UV–Vis Spectrum

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When light passes through a substance, a portion of the light is absorbed while the remaining light is reflected or transmitted. If the molecule absorbs light between the wavelengths of 180–400 nm range, the UV spectrum is obtained, and if it absorbs light in the 400–780 nm wavelength range, the visible spectrum is obtained.     
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UV–Vis Spectroscopy: Molecular Electronic Transitions01:16

UV–Vis Spectroscopy: Molecular Electronic Transitions

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In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this...
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Spectrophotometry: Introduction01:16

Spectrophotometry: Introduction

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Spectrophotometry is the quantitative measurement of the absorption, reflection, diffraction, or transmission of electromagnetic radiation through a material as a function of the intensity and wavelength of the radiation. A spectrophotometer is a device used to measure the change in the radiation intensity caused by its interaction with the material.
The essential components of a spectrophotometer include a source of electromagnetic radiation, a slot for placing a material to be analyzed, and a...
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UV–Vis Spectroscopy: Beer–Lambert Law01:09

UV–Vis Spectroscopy: Beer–Lambert Law

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The Beer-Lambert law describes the relationship between absorbance and concentration, which combines the principles established by scientists Johann Heinrich Lambert and August Beer. Lambert's law states that when light passes through a medium, the loss in intensity is directly proportional to the original intensity and the path length of the light. Beer's law proposed that the transmittance of a solution remains constant if the product of concentration and path length is constant. The...
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Precision Implementation of Minimal Erythema Dose MED Testing to Assess Individual Variation in Human Inflammatory Response
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Spectral Mismatch Effect of Ultraviolet Radiometers in Actual UV-C Measurement.

Yuki Iwasa1, Kenichi Kinoshita1, Hiroshi Shitomi1

  • 1National Metrology Institute of Japan (NMIJ), National Institute of Advanced Industrial Science and Technology (AIST), Ibaraki, Japan.

Photochemistry and Photobiology
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Accurate measurement of ultraviolet C (UV-C) irradiance is crucial for safety and disinfection. Commercial UV radiometers show significant errors due to spectral mismatch, but correction methods can improve accuracy.

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Area of Science:

  • Photobiology
  • Radiometry
  • Environmental Science

Background:

  • Ultraviolet C (UV-C) radiation (100–280 nm) is vital for virus inactivation and ensuring photobiological safety.
  • Commercial UV radiometers are increasingly used in industrial and public health applications to measure UV-C irradiance.

Purpose of the Study:

  • To evaluate the accuracy of four types of commercial UV radiometers for UV-C measurements.
  • To identify the causes of discrepancies in UV-C irradiance measurements.
  • To assess the effectiveness of spectral mismatch correction.

Main Methods:

  • Comparison of commercial UV radiometer readings against reference irradiance values from a spectral irradiance standard.
  • Analysis of spectral mismatch between calibration sources and UV radiometers.
  • Application of spectral mismatch correction to measured values.

Main Results:

  • Commercial UV radiometers exhibited significant discrepancies, with some readings more than double the actual UV-C irradiance.
  • Spectral mismatch between calibration and measurement conditions was identified as a primary cause of these errors.
  • Spectral mismatch correction improved measurement accuracy, bringing most corrected values within 20% of reference values.

Conclusions:

  • The accuracy of commercial UV radiometers for UV-C measurements is questionable without considering spectral characteristics.
  • Spectral mismatch correction is essential for reliable UV-C irradiance assessment.
  • Users must provide spectral information for both the UV source and the radiometer for accurate measurements.