Standards GB - Chinese national standards - Page 164

Standards GB are Chinese national standards, which are issued by China's Standardization Administration Office (SAC).
Chinese national standards are used all over China commonly labeled as GB standards. They determine the united production requirements regarding product safety and quality .
GB standards are often modified or created according to the international standards of ISO, IEC or any other international level. Although, they are largely harmonized, GB standards may differ from international standards .
Approximately 15% of all GB standards are obligatory and they can be identified according to the prefix GB, after which the code of the standards follows:
GB – Obligatory national standards
GB/T – Optional national standards
GB/Z – National steering technical document

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GB/T 12128-1989

Reference sources for the calibration of surface contamination monitors--Beta-emitters and alpha-emitters

Standard published on 29.12.1989

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GB/T 12128-2026

Reference sources for calibration of surface contamination monitors—Alpha-, beta- and photon emitters
Execute Date: october 2026

Standard published on 31.3.2026

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GB/T 12128.2-1999

Reference sources for the calibration of surface contamination monitors--Part 2:Electrons of energy less than 0.15MeV and photons of energy less than 1.5MeV

Standard published on 30.12.1999

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GB/T 12130-2020

Hyperbaric oxygen chambers

Standard published on 29.9.2020

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