Download or read book YY T 1694 2020 Translated English of Chinese Standard YY T 1694 2020 YYT1694 2020 written by https://www.chinesestandard.net and published by https://www.chinesestandard.net. This book was released on 2023-08-31 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: This standard specifies the performance and test methods of optical positioning device for radiation therapy. This standard applies to the optical positioning device for radiation therapy, by optical methods (including visible light, infrared light, laser, etc.).