Defining the transport index (TI) and TI allowed when transporting radioactive materials in Vietnam
I am currently searching about the transportation of radioactive materials. So, how to define the transport index (TI) and TI allowed when transporting radioactive materials in Vietnam? Thank you very much!
Defining the transport index (TI) and TI allowed when transporting radioactive materials in Vietnam (Image from the Internet)
Defining the transport index (TI) and TI allowed when transporting radioactive materials is specified in Article 23 of Circular 23/2012/TT-BKHCN guiding on radioactive material transport safety issued by the Minister of science and technology, as follows:
1. TI for each package, container or for LSA-I or SCO-I material not be packed is defined as follows:
a) For packages containing radioactive material not being fissile material, measuring the maximum radiation dose rate (measurement unit is mSv/h) at distance of 1 (m) from the outside surface of packages. The measured value is multiplied with 10 and the getting result is TI;
b) For packages containing fissile material, the maximum radiation dose rate at distance of 1 (m) from the outside surface of packages has value as follows: 0.4 (mSv/h) for ores or physical crystallized ores of uranium and thorium; 0.3 (mSv/h) for chemical crystallized ores of thorium; 0.02 (mSv/h) for chemical crystallized ores of uranium, except urani hexaflorua. This value is multiplied with 100 and the getting result is TI;
c) For containers and LSA-I and SCO-I material not packed, measuring the maximum radiation dose rate (measurement unit is mSv/h) at distance of 1 (m) from the outside surface of containers and LSA-I and SCO-I material. The measured value is multiplied with the corresponding coefficient specified in table 5, Annex I of this Circular and the getting result is TI;
d) The values of TI getting at points a, b and c clause 1 of this Article are rounded up to the first decimal number (example 1.13 into 1.2), except values equal to or fewer than 0.05 shall be consider as 0.
2. TI for containers or means of transport containing many packages, shall be defined by total TI of all packages or by defining directly the radiation dose rate as prescribed in clause 1 of this Article.
3. Provisions on TI allowed:
a) TI of each package is not more than 10, except case of exclusive use transport;
b) TIs for containers or means of transport with shared use are specified in Table 8 Annex I of this Circular'
c) For transport of LSA-I material, limit of total TI is not provided;
d) For exclusive use, limit of total TI is not provided.
Above is advice on defining the transport index (TI) and TI allowed when transporting radioactive materials. For more detailed information, you can refer to Circular 23/2012/TT-BKHCN. We hope that our advice will help you.
Best Regards!
