GB20664-2006

Limitation concentration of natural radioactivity in non-ferrous metal ores and concentrates products

有色金属矿产品的天然放射性限值

GB 20664-2006 é uma norma nacional chinesa obrigatória vigente: Limitation concentration of natural radioactivity in non-ferrous metal ores and concentrates products. Setor: Meio ambiente. Foco: Proteção ambiental. Entrada em vigor: 1 de mai. de 2007.

A aplicabilidade depende do escopo do produto, da via de certificação, dos avisos da autoridade competente e das regras de transição. Solicite uma tradução ou verifique a fonte antes de usar este registro em uma decisão de conformidade.

Visão geral de conformidade

Esta visão geral está disponível por enquanto apenas em inglês.

Escopo e aplicabilidade

GB 20664-2006 specifies the limitation concentration of natural radioactivity in non-ferrous metal ores and concentrates products. It applies to the exploitation and utilization of ores including copper, lead, zinc, tin, nickel, and cobalt. This standard is mandatory for managing radioactive hazards in these mineral products, and other mineral products may also refer to its provisions.

Requisitos técnicos

Chapter 4 of the standard establishes mandatory requirements for both natural and artificial radioactivity. It sets strict activity concentration limits for specific natural radionuclides, such as those in the Uranium-238, Radium-226, and Thorium-232 decay chains, as well as Potassium-40. Additionally, the standard defines a screening level based on the gamma-radiation dose rate measured at a specific distance from the ore pile. If the measured dose rate is below this screening level, the product is considered to meet the activity concentration limits without needing further complex laboratory analysis. Furthermore, the standard strictly prohibits non-ferrous metal ore products from being contaminated by, or mixed with, artificial radionuclides or radioactive sources.

Métodos de ensaio

The standard outlines a two-tier testing program. The first step is on-site screening using portable gamma-radiation dose rate meters to measure the surface dose rate of bulk or containerized ores. If the screening level is exceeded, laboratory nuclide analysis is conducted using gamma spectrometry according to GB/T 11713. The standard also details specific sampling and sample preparation methods (including conveyor belt, truck, container, and ship cabin sampling) to ensure representative laboratory analysis.

Perguntas frequentes

What products are regulated under GB 20664-2006?

The standard applies to the exploitation and utilization of non-ferrous metal ores and concentrates, specifically including copper, lead, zinc, tin, nickel, and cobalt. Other mineral products may also refer to this standard for compliance.

How does GB 20664-2006 relate to international standards?

It is based on the International Atomic Energy Agency (IAEA) Safety Guide RS-G-1.7 and incorporates China's practical experience in radioactive inspection of non-ferrous metal ores. It sets specific national limits for natural radionuclides and artificial contamination.

What happens if a product exceeds the gamma radiation screening level?

If the screening level is exceeded, the ore must be sampled and sent to a laboratory for radionuclide analysis to determine the exact activity concentration. If a localized 'hot spot' is found, further qualitative analysis is required to check for artificial radioactive contamination.

The summary above provides a high-level overview of GB 20664-2006. To ensure complete compliance for your mineral products entering the Chinese market, a precise and professional translation of the full technical specifications is essential. Purchase our high-quality English translation of GB 20664-2006 today to access all detailed parameters, sampling tables, and testing procedures.

Indicações de aplicabilidade

Tipo: Proteção ambiental
CCS: D40
ICS: 73.060
Órgão competente: Ministry of Ecology and Environment
Comitê técnico: Ministry of Ecology and Environment