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Radioactivity in food, food VN
census and survey "of radiation in some food items, food (LTTP) import and export mainly in Vietnam" is the text of the research project number 11/09/NLNT made by the research team Institute of Science and Nuclear Engineering after two years 2007-2008.

Subject is the Ministry of Science and Technology funded and organized over test in the past September 2009.

In a radioactive substance LTTP?

Nuclear reactor Dalat (photo source: VAEC) 

To preserve food and food (LTTP), many countries have used many different methods, including methods of irradiation.  LTTP that is projected onto the beam energy gamma below 2 million electron volt (2 MeV) emitted from Cobalt-60 or cesium-137, Regen beam with energy below 5 million electron volt (MeV) emitted from has X-ray or electron beam with energy below 10 million electron volt (5MeV) emitted from accelerators.

Some consumers wondered whether other LTTP radiation such as radioactive substances to create harmful to health or not?Can answer is no, because all kinds of Regen-ray radiation, gamma, electron energy can not be set lower as the nuclear reactions create to create radioactive material in other LTTP, or if there is complete negligible.
Meanwhile, not everyone knows that in itself rice, fish ... as well as all other material on earth which always contains a natural radiation we can measure.These are the radioactive elements in the array Uranium, thorium isotopes and K-40. In addition, a number of places that the pollution of artificial radioactive isotopes caused by atomic bomb testing on the ground many years ago, or by the Chernobyl nuclear incident, in which notable current the artificial radioactive isotope Cs-137.

Therefore, the concentration of radioactivity in LTTP remains a target that consumer interest.

Limit the concentration of radioactive

 Of course, only when the concentration of radioactive substances in LTTP overcome a limit (or level allowed) that it will penetrate into the body through eating new way affect significant harm to health people. Limits that allow the equivalent under the provisions of the Agency for International Atomic Energy (IAEA) and Radiation Safety Committee International (ICRP).

 Laboratory at the Institute of Science and Nuclear Engineering
(Photo Source: BBC) 

The above-mentioned international organizations and countries like the U.S., some European countries. Japan ... is to build its own standards, or general information for each type of radioactive material, and each food.
For instance, the Radiation Safety Committee International (ICRP) dose level given instructions to ensure safety (PAG) and the level concentration limit (DILs) by age group, the food in the commercial unit concentration of Bq / kg for artificial radioactive substances.
However, the two organizations, the concentration of radioactive substances is even can cause a certain influence to people (depending on the dose of radiation because they trigger) and therefore should limit the concentration down as low as possible in the ability to reasonably possible (ALARA principle).
 According to this principle, people tend not popular types of content LTTP have higher levels of radiation inherent in the LTTP aquaculture, traditional farming. In particular, products containing radioactive LTTP artificial being boycotted and banned from import, such products originating from areas around Chernobyl nuclear power plant.
In the context of international integration, and especially when becoming a member of the International Trade Organization (WTO), technical barriers to the LTTP level radioactive matter must set out to prove the products of Vietnam have low levels of radiation allowed, while avoiding the import of products with highly radioactive from other countries.

Clear objectives and results of reliability
As well as meeting the requirements above the Ministry of Science and Technology for implementation of project "Investigation of radiation in some food items, food import and export mainly to proceed to build database of radioactive material in the food, food in Vietnam. "
A volume of 130 samples of food and food in the country, such as the Nuclear Research Institute (Dalat) and imported were collected and analyzed.  The criteria include the analysis of natural radioactivity in the chain of Uranium, thorium, isotopes K-40 and human-made radioactive Cs-137.
The samples collected included groups: a / The export as rice and tea, coffee, c / The import as milk, d / LTTP group consumed primarily as vegetables; beans; maize; potato; cassava.
Analysis method is to use the most modern gamma spectrometer is the detector of ultra-pure Germani (HPGeD). In addition to determining the concentration of the radioactive isotope radioactivity above, the project also measure the total activity of radioactive alpha and beta rays has the form of the above method of counting alpha and beta.
Subject conducted by the research team Institute for Nuclear KH & KT has many years experience in the field of environmental radioactivity, including members such as Nguyen Quang Long, Tran Thi Tuyet Mai, Ngo Tien The Nguyen Thu Ha Dinh Thi Bich Lieu, etc ... Great Northern Thu

 Laboratory at the Institute of Science and Nuclear Engineering
(Photo Source: BBC)
 

The above-mentioned international organizations and countries like the U.S., some European countries. Japan ... is to build its own standards, or general information for each type of radioactive material, and each food.
For instance, the Radiation Safety Committee International (ICRP) dose level given instructions to ensure safety (PAG) and the level concentration limit (DILs) by age group, the food in the commercial unit concentration of Bq / kg for artificial radioactive substances.
However, the two organizations, the concentration of radioactive substances is even can cause a certain influence to people (depending on the dose of radiation because they trigger) and therefore should limit the concentration down as low as possible in the ability to reasonably possible (ALARA principle).
 According to this principle, people tend not popular types of content LTTP have higher levels of radiation inherent in the LTTP aquaculture, traditional farming. In particular, products containing radioactive LTTP artificial being boycotted and banned from import, such products originating from areas around Chernobyl nuclear power plant.
In the context of international integration, and especially when becoming a member of the International Trade Organization (WTO), technical barriers to the LTTP level radioactive matter must set out to prove the products of Vietnam have low levels of radiation allowed, while avoiding the import of products with highly radioactive from other countries.

Clear objectives and results of reliability
As well as meeting the requirements above the Ministry of Science and Technology for implementation of project "Investigation of radiation in some food items, food import and export mainly to proceed to build database of radioactive material in the food, food in Vietnam. "
A volume of 130 samples of food and food in the country, such as the Nuclear Research Institute (Dalat) and imported were collected and analyzed.  The criteria include the analysis of natural radioactivity in the chain of Uranium, thorium, isotopes K-40 and human-made radioactive Cs-137.
The samples collected included groups: a / The export as rice and tea, coffee, c / The import as milk, d / LTTP group consumed primarily as vegetables; beans; maize; potato; cassava.
Analysis method is to use the most modern gamma spectrometer is the detector of ultra-pure Germani (HPGeD). In addition to determining the concentration of the radioactive isotope radioactivity above, the project also measure the total activity of radioactive alpha and beta rays has the form of the above method of counting alpha and beta.
Subject conducted by the research team Institute for Nuclear KH & KT has many years experience in the field of environmental radioactivity, including members such as Nguyen Quang Long, Tran Thi Tuyet Mai, Ngo Tien The Nguyen Thu Ha Dinh Thi Bich Lieu, etc ... Great Northern Thu

Gamma spectrometer (Source: TL) 

Results obtained by two methods mentioned above were compared with each other and coordinate.In addition, to ensure reliability of data collected, cross-checking with the coordination between the different laboratories in the country and internationally have been conducted in accordance with the rules closely follow the financial guide the IAEA.
Specifically, this would lead to an overall best results:

a / Activities of radioactive K-40 in the sample average value 255.3 Bq / kg; lowest is 10.4 Bq / kg, the highest is 856.6,
 b / Activities of Ac-228 radioactivity in the sample average value is 1.3 Bq / kg, the lowest 0.3 Bq / kg, the highest is 9.0 Bq / kg,
 c / Active Bi-level radiation in the 214 samples had an average value of 1.1 Bq / kg, the lowest 0.3 Bq / kg, the highest is 3.1,
d / Activities of total beta radioactivity in the sample average value 110.9 Bq / kg, the lowest was 2.1 Bq / kg, the highest is 519.3,
 e / Active level of alpha radiation in samples with an average value 31.9 Bq / kg, the lowest detection limit is lower (ND), the highest is 306.7 Bq / kg,
 g / Activities of gamma radiation in the form of a mean value of 369.6 Bq / kg, the lowest is 25.7 Bq / kg, the highest is 2029.1 Bq / kg.

 General results at the top with many figures and tables and graphs of other details, the authors of the report presented before the Council ministerial-level checked and concluded that: In comparison with the limit International made, "artificial radioactivity concentration (Ac-228 and Bi-214) in LTTP within the allowed limit exports. In addition, the concentration of radioactive (natural) in Vietnam is very low LTTP standpoint of radiation safety for users, and is not at can cause harmful effects to public health " .

VNN

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