GB/T 38724-2020 in English
VALIDFurniture harmful substances—Test method for radioactivity
- Issued on:2020-04-28
- Implemented on:2020-11-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$156.00
《GB/T 38724-2020家具中有害物质 放射性的测定》由TC480（全国家具标准化技术委员会）归口，主管部门为中国轻工业联合会。
Introduction
Analysis of the core content of the standard
This standard has established a complete testing system for the radioactive risks of inorganic non-metallic materials (such as ceramics, cement, etc.) in furniture products. The main technical indicators include:
| Test items | Limit value (Bq/kg) | Calculation formula |
|---|---|---|
| Internal radiation index (Radium-226) | 200 | CRa/200 |
| External radiation index (Radium-226/Thorium-232/Potassium-40) | 370/260/4200 | CRa/370 + CTh/260 + CK/4200 |
Key detection technology
1. Instrument configuration requirements
The standard specifies the technical parameters of two types of Y spectrometers:
- Sodium iodide Y spectrometer: energy resolution ≤9%, background counting rate ≤8/s
- Semiconductor Y spectrometer: energy resolution ≤2.5keV, higher stability
2. Sample processing flow
- Sampling ≥1kg of inorganic non-metallic materials
- Grind to 0.16mm particle size
- Dry at 105±5℃ to constant weight (weight difference ≤0.1g)
- Seal and let stand for 10 days to wait for radioactive equilibrium
Recommendations for the implementation of the standard
Key points for corporate compliance
1. Raw material control: It is recommended to establish a supplier radioactivity detection file and give priority to building materials certified by GB6566
2. Detection cycle: Different batches of inorganic non-metallic materials should be tested separately, and mixed materials should be tested separately according to their components
3. Result determination: When the test value is within the range of ±20% of the limit value, the measurement uncertainty must be evaluated
Technology evolution analysis
Main improvements of this standard compared with GB6566-2010:
- New material requirements for standard sample boxes (ABS resin/polyethylene)
- Clearly define the differences in standard source configurations for different spectrometers
- Refine the measurement uncertainty control requirements (≤20%)
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