Shadowing Practice: What is radiation? - Learn English Speaking with Video
Les maken...
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Music What do smoke detectors,
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emergency lights, and nuclear power all have in common?
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Radiation.
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But what exactly is radiation?
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Thanks to high school science class, most of us have heard about radiation.
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But many of us may not know exactly what it is.
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I'm Julie, and I work for the Canadian Nuclear Safety Commission.
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Simply put, radiation is the release of energy in the form of moving waves or streams of particles.
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This energy can be low -level, like microwaves and cell phones, or high -level, like x -rays or cosmic rays from outer space.
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These are known as non -ionizing and ionizing radiation.
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But if we really want to understand radiation, we need to go inside the tiny world of the atom.
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Remember that high school science class?
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Atoms are the microscopic building blocks of all matter in the universe.
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Everything around us is made up of atoms, from the largest galaxies to our own bodies.
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The center of the atom is called the nucleus.
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That's where the word nuclear comes from.
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There is a tremendous amount of energy inside.
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The nucleus of an atom is made up of two particles, protons, which carry a positive charge, and neutrons, which have no charge.
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Outside the nucleus are electrons, which carry a negative charge the attraction of these negative electrons to the positive nucleus is what keeps the atom together.
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Now, every element in the periodic table has a specific number of protons and neutrons, but sometimes an atom will have too many or too few neutrons.
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When this happens, it becomes unstable or radioactive.
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An unstable atom is called a radioisotope.
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For example, two extra neutrons in a hydrogen atom creates the radioisotope tritium.
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That's the stuff that helps make exit lights glow in the dark.
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Radioactive atoms want to become stable again, so they release energy until they get back to a balanced state.
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This process is known as radioactive decay, and there are three main types, alpha, beta, and gamma.
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Alpha particles are heavy and travel small distances.
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Beta particles are lighter and travel further.
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And gamma radiation is actually a wave, and it travels the farthest of all.
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The time it takes for half of the radioactive atoms of a radioisotope to decay is called a half -life.
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Half -lives can range from a fraction of a second to billions of years.
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Let me give you an example of how half -lives come into play in nuclear medicine.
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Doctors inject patients with the radioisotope Technetium -99M, which emits gamma radiation.
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A gamma camera can then take pictures of the patient's insides to help with the diagnosis.
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The relatively short half -life of six hours for this radioisotope makes it ideal for these types types of tests.
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Let's pretend these jelly beans are the nuclei of TEC -99M.
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After one half -life, half the atoms still in the body remain unstable or radioactive.
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After two half -lives, one quarter of the atoms remain radioactive.
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After three half -lives, well, you get the idea.
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After 24 hours, almost all the radioactivity is gone, thanks to radioactive of decay and the body's natural, shall we say, processing?
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And that ends our science class on radiation.
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Congratulations, you passed.
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Now for the bonus question.
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Can you tell me who keeps an eye on the nuclear sector in Canada?
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That would be us, the Canadian Nuclear Safety Commission.
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We regulate the use of nuclear substances and materials and ensure that all nuclear materials are used for peaceful purposes.
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We also work to protect your health and safety, as well as that of the environment.
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The Canadian Nuclear Safety Commission.
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The answers you need from a source you can trust.
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Visit us at nuclearsafety .gc .ca on YouTube or Facebook.
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Woordenschat en spreektips bij deze les
Deze video bevat 50 zinnen en 628 woorden om na te spreken. Het gesproken deel duurt 3:55. De spreker praat in een natuurlijk tempo van ongeveer 160 woorden per minuut, dicht bij een alledaags gesprek. Slechts 79% van de woorden hoort bij de 3.000 meest gebruikte Engelse woorden, dus de woordenschat is pittig.
Belangrijke woorden in deze video
15 woorden uit de video die het leren waard zijn, met uitspraak en betekenis:
| Woord | Uitspraak | Betekenis |
|---|---|---|
| atom zelfstandig naamwoord | /ˈætəm/ | atoom |
| radiation zelfstandig naamwoord | /ˌɹeɪ.diˈeɪ.ʃən/ | straling |
| radioactive bijvoeglijk naamwoord | /ˌɹeɪdioʊˈæktɪv/ | radioactief |
| nucleus zelfstandig naamwoord | /ˈnuː.kli.əs/ | kern |
| particle zelfstandig naamwoord | /ˈpɑɹtək(ə)l/ | deeltje, partikel |
| gamma zelfstandig naamwoord | /ˈɡæ.mə/ | gamma |
| unstable bijvoeglijk naamwoord | /ʌnˈsteɪ.bəl/ | instabiel |
| decay zelfstandig naamwoord | /diˈkeɪ/ | verval |
| alpha zelfstandig naamwoord | /ˈæl.fə/ | alfa |
| beta zelfstandig naamwoord | /ˈbeɪtə/ | bèta |
| stable zelfstandig naamwoord | /ˈsteɪ.bəl/ | stal, paardenstal |
| element zelfstandig naamwoord | /ˈɛləmənt/ | element |
| bonus zelfstandig naamwoord | /ˈbəʊ.nəs/ | bonus, extraatje |
| ideal bijvoeglijk naamwoord | /aɪˈdi(ə)l/ | ideaal, optimaal |
| congratulations | /kənˌɡɹæt͡ʃəˈleɪʃ(ə)nz/ | gefeliciteerd, proficiat |
Uitspraak om op te letten
- De klanken “sh” en “zh”: radiation /ˌɹeɪ.diˈeɪ.ʃən/, congratulations /kənˌɡɹæt͡ʃəˈleɪʃ(ə)nz/, attraction /əˈtɹækʃn̩/, fraction /ˈfɹæk.ʃən/
- Lange woorden — let op de klemtoon: radiation /ˌɹeɪ.diˈeɪ.ʃən/, radioactive /ˌɹeɪdioʊˈæktɪv/, congratulations /kənˌɡɹæt͡ʃəˈleɪʃ(ə)nz/, periodic /ˌpɪɹiˈɑdɪk/, microscopic /ˌmaɪ.kɹəˈskɑ.pɪk/
Zo oefen je met deze video
- Luister de hele video één keer zonder te spreken en noteer de woorden die je niet kent.
- Begin op 0,75× snelheid, spreek zin voor zin na en ga terug naar normale snelheid zodra het makkelijk gaat.
- Neem jezelf op en vergelijk met het origineel; let daarbij op woorden als atom, radiation, radioactive.
Wat is de Shadowing-techniek?
Shadowing is een wetenschappelijk onderbouwde taalleermethode die oorspronkelijk is ontwikkeld voor professionele tolkentraining en gepopulariseerd door polyglot Dr. Alexander Arguelles. De methode is eenvoudig maar krachtig: je luistert naar native Engelse audio en herhaalt het onmiddellijk hardop — als een schaduw die de spreker volgt met slechts 1–2 seconden vertraging. In tegenstelling tot passief luisteren of grammaticadrills, dwingt shadowing je hersenen en mondspieren om echte spraakpatronen tegelijkertijd te verwerken en te reproduceren. Onderzoek toont aan dat het de uitspraaknauwkeurigheid, intonatie, ritme, verbonden spraak, luisterbegrip en spreekvaardigheid aanzienlijk verbetert — waardoor het een van de meest effectieve methoden is voor IELTS Speaking-voorbereiding en echte Engelse communicatie.