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YY/T 1896-2023Method for defining the wavelength range of spectral radiation therapy equipment (English PDF)

光谱辐射治疗设备波长范围界定方法

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Issued by

NMPA

Level / Type

Industry · Recommended

Issue date

June 20, 2023

Implementation date

July 1, 2024

Scope

YY/T 1896-2023 is the English-translated version of 光谱辐射治疗设备波长范围界定方法.

YY/T 1896-2023 is the Chinese standard "Method for defining the wavelength range of spectral radiation therapy equipment". Its scope clause reads: This document specifies the method for defining the wavelength range of spectral radiation therapy equipment (hereinafter referred to as "phototherapy equipment").

This document is suitable for clinical use of incoherent light including visible light, infrared light, ultraviolet light and other wavelengths from 180nm to 3000nm.

Treatment equipment. Its clauses include normative reference documents; terms and definitions.

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Document preview — YY/T 1896-2023

National Standard of the People's Republic of China

ICS: 11.040.60
Classification: C42

Issued by: National Medical Products Administration

Preface
1 Scope
2 Normative reference documents
3 Terms and Definitions
4 Wavelength range definition method
5 Principles for using wavelength range definition method

1 Scope

This document specifies the method for defining the wavelength range of spectral radiation therapy equipment (hereinafter referred to as "phototherapy equipment").

This document is suitable for clinical use of incoherent light including visible light, infrared light, ultraviolet light and other wavelengths from 180nm to 3000nm.

Treatment equipment.

2 Normative reference documents

This document has no normative references.

3 Terms and definitions

The following terms and definitions apply to this document.

3.1 RMS spectrum width

Under standard working conditions, the spectrum is approximated by the Gaussian function Plambda. If sigmarms is the RMS spectrum width value, then.

sigma2rms=

%00

lambda-lambda0 2Plambda dlambda

%00

Plambdadlambda

In the formula.

lambda ---Light source wavelength;

lambda0 ---Central wavelength;

Plambda ---spectral intensity at wavelength lambda.

Note. The RMS spectrum width is equivalent to the weighted average spectrum width, which can more accurately reflect the spectral characteristics.

3.2

-3dBspectralwidth-3dBspectralwidth

Under standard operating conditions, the wavelength interval between two points of the spectral line where the amplitude of the peak wavelength of the main longitudinal mode drops by half, where -3dB=

10lg(1/2).

3.3

-20dBspectralwidth-20dBspectralwidth

Under standard operating conditions, the amplitude of the peak wavelength of the main longitudinal mode drops by 20dB by the wavelength interval between two points of the spectral line, where

-20dB=10lg(1/100).

3.4

The relative intensity of the spectrum is the wavelength range between the two wavelength points with the largest distance corresponding to a specific ratio of its peak.

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 7 pages — is available in the English PDF.

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