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Examination of radioactive materials for food. Determination of americium-241
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Basic data
| Standard ID | WS/T 234-2002 (WS/T234-2002) |
| Description (Translated English) | Examination of radioactive materials for food. Determination of americium-241 |
| Sector / Industry | Health Industry Standard (Recommended) |
| Classification of Chinese Standard | C57 |
| Classification of International Standard | 13.28 |
| Word Count Estimation | 10,194 |
| Date of Issue | 12/3/2002 |
| Date of Implementation | 8/1/2003 |
| Quoted Standard | GB 14883.1 |
| Summary | This standard specifies the types of food Americium -241 (^ (241) Am) measurement method. This standard applies to the determination of americium-241 in various foods. The method detection limit per gram of sample ashes of 3 �� 10 ^ (- 5) B (q). |
WS/T 234-2002: Examination of radioactive materials for food. Determination of americium-241
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Examination of radioactive materials for food.Determination of americium-241
ICS 13.280
C57
People's Republic of China Health Industry Standard
Inspection of radioactive materials in food
Determination of 镅-241
Released on.2002-12-03
Implementation of.2003-08-01
Published by the Ministry of Health
Foreword
In order to meet the requirements of international food trade and to protect public food safety, this standard has been formulated. This standard is in research and evaluation at home and abroad.
Based on the measurement method of 241Am in biological samples, refer to the "241Am Analysis Method" standard promulgated by the Japanese Science and Technology Agency to absorb domestic
241Am analysis methodological research results, compiled by program design, process experiment verification.
Appendix A and Appendix B of this standard are informative annexes.
This standard was proposed by the Department of Health Legal System and Supervision of the Ministry of Health of the People's Republic of China.
This standard was drafted. Institute of Radiation Medicine, Chinese Academy of Medical Sciences, China Institute of Atomic Energy.
The main drafters of this standard. Liu Shutian, Liu Qingfen, Zhu Hongda, Yang Dating, Zhao Yongcheng.
This standard is interpreted by the Ministry of Health of the People's Republic of China.
Inspection of radioactive materials in food
Determination of 镅-241
1 Scope
This standard specifies the determination method of 镅-241 (241Am) in various foods.
This standard applies to the determination of 镅-241 in various foods. The lower limit of detection of the method is 3×10-5Bq per gram of sample ash.
2 Normative references
The terms of the following documents are incorporated by this standard into the terms of this standard. All dated references, followed by all
Modifications (not including errata content) or revisions do not apply to this standard, however, parties to agreements based on this standard are encouraged to study
Is it possible to use the latest version of these files? For documents that are not dated, the latest edition applies to this standard.
GB 14883.1 General rules for the inspection of radioactive materials in food
3 Principle
After the food sample is carbonized at 450 ° C in a carbonized, high-temperature furnace, the organic matter is destroyed by nitric acid and perchloric acid, and the hydrofluoric acid is desiliconized and treated by the total dissolution method.
A sample solution of 6 mol/L nitric acid. Separation of Fe3+ by 1-phenyl-3-methyl-4-benzoylpyrazolone-5 (PMBP)-benzene extraction
Other trivalent impurities, extracted with di(2-ethylhexyl)phosphate (HDEHP)-phosphorus pentoxide (P2O5)-benzene (C6H12) and retained in the aqueous phase
After the organic phase is diluted twice with benzene, the hydrazine is back extracted with an ammonium carbonate solution to further separate from the impurities. After the stripping solution is evaporated to dryness,
1mol/L HNO3-93%CH3OH system was dissolved, adsorbed with anion exchange column, purified by fractional elution, 1.5mol/L
HCl-86% CH3OH desorbed hydrazine. Quantitative electrodeposition source in (NH4)2C2O4-H2SO4-HC1 system, 241Am measured by α spectrometer
The alpha radioactivity of the site. Calculate the 241Am activity concentration value of the measured food.
4 reagents and materials
Analytical reagents in accordance with national or industry standards and distilled water or water of equivalent purity are used for analysis unless otherwise stated.
4.1 Nitric acid. The mass fraction is 65.0% to 68.0%.
4.1.1 Nitric acid. (3+2).
4.1.2 Nitric acid. (1+1).
4.1.3 Nitric acid. 6mol/L.
4.1.4 Nitric acid. 4mol/L.
4.2 Hydrochloric acid. The mass fraction is 36.0% to 38.0%.
4.2.1 Hydrochloric acid. 6.2 mol/L.
4.3 Sulfuric acid. 0.1 mol/L.
4.4 Hydrogen peroxide. The concentration is not less than 30% (mass fraction).
4.5 Ammonia. Concentration 25% to 28% (mass fraction).
4.5.1 Ammonia. (1+1).
4.5.2 Ammonia. 1% (mass fraction).
4.6 Ammonium oxalate. 5% (mass fraction).
...
