How a Thermoelectric Device (TE) Resist the Radiation?

The cladding takes care of the radiation.

If I put the TE in the heavy radiation, what material should be shosen to protect the TE? I find that the radiation resource used in the RTG is alpha, which can be easy stopped.

A sheet of paper will stop α-radiation. Does that help?

I know that. Now I want to know, if the radiation is not alpha-radiation, now what is the answer? I put the TE naked near the nuclear reactor materials

Well, if it isn't α, what is it? What is the source isotope?

if the radiation is thermal (eV) neutron, fast (MeV) neutron, fission fragment or the combination.

Tiresome indeed. GA

Thanks for your good reply. I am a learner.

I need more information to understand the damage effect in the radiation.

Thanks. maybe, i need to pick up a book to read.

That's the right attitude to have! Being a learner is definitely a good thing.

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How is your understanding of radiological fundamentals?

Would you say you are familiar with various microscopic arrangments in material that affect physical properties?4

Are you familiar with the various failure mechanisms? How about corrosion mechanism?

A good background in these subjects will make your intended path of study much more enjoyable and rewarding.

If the radiation isn't α, then why state that it is?

_{'Confused', of Dodman's Lane.}

As I understand it, methinks the OP is stating that the radiation source in RTGs is alpha (it is; in RTGs the heat source is typically a slug of plutonium), but not necessarily an alpha source in his application.

Lead.

Lead can only stop the gama or X-radiation. it is not effective to stop the neutron radiation.

Now, I have some questions:

1. what materials can be used in the complex heavy energy radiation?

2. what effect of electricity and thermoelectricity under the heavy energy radiation?

Please Google: what materials can be used in the complex heavy energy radiation

Peruse the related links & then come back with your feedback.

Regret, I am unable to fathom, the import of your question #2.

Where low to moderate amount of heat is generated then it must be handled by a well known Thermo Eletric Device.

I think that either everyone here has been misreading this question or a translation into English has put the "cart before the horse". A thermoelectric device is a radiation source that converts the heat of nuclear decay into electricity. The TE device itself does not require radiation shielding from another source unless the OP is worried about external radiation accelerating the rate of decay. Others here have already addressed the more likely concern of radiation from the TE to other things, but technically this is not what the OP actually asked.

''.... A thermoelectric device is a radiation source that converts the heat of nuclear decay into electricity.....''

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I think you might have intended to type something slightly different. While and RTG does contain a source of radiation, many thermoelectric devices are not RTG and do not have an attached radiation source.

If your concern is mainly damage from neutron fluxes, your TEs can be shielded by materials having a high neutron 'cross-section', such as the element gadolinium. This element has the highest neutron absorption cross-section in the entire periodic table.

Google also neutron moderators and neutron poisons.

''....This element has the highest neutron absorption cross-section in the entire periodic table....''

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All depends on the specific isotope and the energy of the neutron. For example, for thermal neutron, the absorption cross section of Xe-135 if roughly an order of magnitude higher than of any Gd isotope.