Pratique du Shadowing: Radioactive Waste - The Journey to Disposal - Apprendre l'anglais à l'oral avec la vidéo
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In Austria, technicians check the welding on pipes for a hydropower plant.
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Over in Indonesia, spices are being cleared of biological contaminants.
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In Budapest, pharmaceuticals are being created.
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And operators run a Chinese power plant that provides electricity to thousands of homes.
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These are common activities, taking place every day in many parts of the world.
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They rely on nuclear technologies that use radioactive materials.
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The benefits of these technologies, whether used in agriculture, industry or medicine, are plentiful.
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like other processes they generate waste this waste contains radioactive elements people
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and the environment must be protected from the potential hazards of such waste now
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and in the future so countries need to manage their radioactive waste safely and securely
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and make sure it's kept under control this This responsibility starts as soon as a country decides to use nuclear technologies.
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And techniques are available to manage radioactive waste.
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Radioactive elements are unstable and emit radiation as they decay.
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The decay rate is measured in half -lives.
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This means the time it takes for the activity of a radionuclide to halve.
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After another half -life period, the activity is again down by half.
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This continues, and eventually the material emits only negligible amounts of ionizing radiation.
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Each radionuclide has its own half -life.
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So, waste can be hazardous for periods of time stretching from a few hours
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or days up to hundreds of thousands of years.
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Radioactive waste is classified depending on the half -lives and the level of radioactivity of the nuclides it contains.
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According to the IAEA's safety standards, there are six classes of radioactive waste.
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Each waste class has different management and disposal needs.
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Techniques exist to manage this radioactive waste
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and the spent nuclear fuel from power plants and research reactors in a safe and secure way.
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Waste containing only radionuclides with very short half -lives can be stored for a few days
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or years to allow for the decay of the nuclides waste.
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This type of waste is usually generated when radioactive materials are used for research or medical purposes.
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Eventually, it can be disposed of as conventional waste.
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Other waste forms need to be managed for radioactive waste disposal.
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By volume, most radioactive waste has low levels of radioactivity.
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This includes the majority of the waste
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that comes from the routine operation of a nuclear power plant
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and waste that's produced when medical and industrial devices that use radioactive sources are no longer needed.
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This could be because the source has decayed
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and the remaining radioactivity isn't strong enough for its original purpose or the device is damaged or obsolete.
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In these cases the radioactive source needs to be removed from the equipment and prepared for storage and eventual disposal.
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Some countries process their waste at centralized waste management and storage facilities.
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Upon arrival the waste is controlled to check for any surface contamination and the radiation levels are measured.
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Details of the waste type are noted for the inventory before
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the waste can be processed further to prepare it for storage and disposal.
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Such processes can involve measures to reduce the volume of the waste such as compaction and incineration.
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Encapsulation is used to immobilize the contaminants.
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After being placed in appropriate containers the waste is stored.
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It will remain in this kind of facility until a suitable place or system for its disposal is established.
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Many countries already have near -surface disposal sites for waste with low levels of radioactivity.
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These facilities can consist of silos in the ground, trenches or vaults.
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Once they're full, they will be backfilled with grout or soil, sealed and closed according to their disposal license.
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Alongside the radioactive waste produced by the routine activities at a nuclear power plant,
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nuclear power generation produces spent fuel or high -level waste.
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Such waste is low in volume but has a high level of radioactivity and it remains hazardous for thousands of years.
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In some countries, the spent nuclear fuel
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that can no longer be used to generate electricity is reprocessed to extract usable material for new fuel.
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Other countries consider the spent fuel as waste for direct disposal.
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In all countries generating nuclear power,
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the spent fuel is currently stored either in water pools or dry casks at secure storage facilities.
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waste management experts around the world agree that underground geological disposal is the best
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and preferred option as a solution for high -level waste
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and spent nuclear fuel this would be in a location where geological conditions are stable
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and the waste can be contained and isolated from humans
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and the environment until it no longer presents a hazard
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while there's still no geological disposal facility of this type in
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operation some countries have already selected a location designed the facility
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and conducted safety assessments a few for example Sweden Finland and France are well advanced in their development.
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Radioactive waste with low and intermediate levels of activity is already being disposed of in geological facilities in several countries.
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Since its inception, the IAEA has assisted its member states to safely manage their radioactive waste.
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The IAEA produces internationally respected safety standards and offers technical guidance.
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At its headquarters in Vienna, Austria, the IAEA hosts meetings and workshops,
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bringing together experts from around the world to exchange experiences.
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International teams, led by the IAEA, review security measures at waste storage facilities.
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The IAEA also helps countries to securely store high -activity sources in advance of disposal.
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Its experts run training courses in radioactive waste management
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and conduct missions worldwide to assist with the conditioning of disused sealed radioactive sources.
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Its safeguards inspectors make sure that all nuclear material,
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including spent nuclear fuel, is accounted for and used solely for peaceful purposes.
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As populations grow and nations develop, we'll be making more use of nuclear technologies.
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This will result in more radioactive waste.
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and more waste means more needs to be done to meet
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the challenges with the technologies now available the new developments in the pipeline
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and the continuous support of the IAEA countries are well equipped to manage radioactive waste safely and securely.
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Transcription by CastingWords
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Tout pour parler couramment
Prononciation IAChaque phrase notée
Phonétique (IPA)Maîtrisez chaque son
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Vocabulaire et conseils d’expression pour cette leçon
Cette vidéo contient 81 phrases et 1020 mots à répéter en shadowing. La partie parlée dure 9:35. Le locuteur parle lentement, environ 106 mots par minute, ce qui laisse le temps d’imiter chaque son. Seuls 80 % des mots font partie des 3 000 mots les plus courants en anglais, le vocabulaire est donc exigeant.
Vocabulaire clé de cette vidéo
15 mots de la vidéo à retenir, avec leur prononciation et leur sens :
| Mot | Prononciation | Sens |
|---|---|---|
| radioactive adjectif | /ˌɹeɪdioʊˈæktɪv/ | radioactif |
| disposal nom | /dɪsˈpoʊ.zəl/ | disposition |
| generate verbe | /ˈd͡ʒɛn.ə.ɹeɪt/ | générer |
| decay nom | /diˈkeɪ/ | décrépitude |
| radiation nom | /ˌɹeɪ.diˈeɪ.ʃən/ | radiation |
| safely adverbe | /ˈseɪfli/ | prudemment |
| technique nom | /tɛkˈniːk/ | technique |
| element nom | /ˈɛləmənt/ | élément |
| assist verbe | /əˈsɪst/ | assister, aider |
| routine nom | /ɹuˈtin/ | routine |
| seal nom | /siːl/ | sceau, cachet |
| hazard nom | /ˈhæzəd/ | hasard, danger |
| hazardous adjectif | /ˈhæ.zɚ.dɪs/ | hasardeux |
| dispose verbe | /dɪsˈpoʊz/ | se débarrasser de, éliminer |
| stable nom | /ˈsteɪ.bəl/ | étable, écurie |
La grammaire de cette vidéo
Les structures que le locuteur utilise le plus, avec les mots exacts de la vidéo :
| Structure | Dans la vidéo |
|---|---|
| Voix passive be + participe passé — l’accent est mis sur ce qui arrive, pas sur qui le fait | being cleared · being created · must be protected |
| Present perfect have/has + participe passé — une action passée qui compte encore maintenant | has decayed · have already selected · has assisted |
Prononciation à surveiller
Le locuteur utilise 3 contractions et formes réduites, comme isn't, they're, we'll. Prononcez-les sous leur forme courte, telles que vous les entendez.
- Les sons « sh » et « zh »: radiation /ˌɹeɪ.diˈeɪ.ʃən/, establish /ɪˈstæb.lɪʃ/, conventional /kənˈvɛnʃənl̩/, workshop /ˈwɝk.ʃɑp/, contamination /kənˌtæm.əˈneɪ.ʃən/
- Mots longs — placez bien l’accent: radioactive /ˌɹeɪdioʊˈæktɪv/, geological /ˌd͡ʒi.əˈlɑdʒ.ɪk.əl/, radiation /ˌɹeɪ.diˈeɪ.ʃən/, electricity /ɪˌlɛkˈtɹɪsɪti/, agriculture /ˈæɡ.ɹɪˌkʌl.t͡ʃɚ/
Comment s’entraîner avec cette vidéo
- Écoutez la vidéo en entier une fois sans parler et notez les mots que vous ne connaissez pas.
- Répétez phrase par phrase à vitesse normale, en reprenant chacune jusqu’à ce que votre rythme corresponde à celui du locuteur.
- Enregistrez-vous et comparez avec l’original, en faisant attention à des mots comme radioactive, disposal, generate.
Qu'est-ce que la technique du Shadowing ?
Le Shadowing est une technique d'apprentissage des langues fondée sur la science, développée à l'origine pour la formation des interprètes professionnels. Le principe est simple mais puissant : vous écoutez de l'anglais natif et le répétez immédiatement à voix haute — comme une ombre suivant le locuteur avec un décalage de 1 à 2 secondes. Les recherches montrent une amélioration significative de la précision de la prononciation, de l'intonation, du rythme, des liaisons, de la compréhension orale et de la fluidité.