Shadowing Practice: What is radiation? - Learn English Speaking with Video
Ders oluşturuluyor...
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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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Bu dersin kelimeleri ve konuşma notları
Bu videoda gölgeleme çalışması için 50 cümle ve 628 kelime var. Konuşma bölümü 3:55 sürüyor. Konuşmacı dakikada yaklaşık 160 kelimeyle, günlük konuşmaya yakın doğal bir hızda konuşuyor. Kelimelerin yalnızca %79’i İngilizcede en sık kullanılan 3.000 kelime arasında, bu yüzden kelime dağarcığı zorlayıcı.
Bu videodaki önemli kelimeler
Videodan öğrenmeye değer 15 kelime, telaffuzu ve anlamıyla:
| Kelime | Telaffuz | Anlam |
|---|---|---|
| atom isim | /ˈætəm/ | atom |
| radiation isim | /ˌɹeɪ.diˈeɪ.ʃən/ | ışınım |
| radioactive sıfat | /ˌɹeɪdioʊˈæktɪv/ | radyoaktif |
| particle isim | /ˈpɑɹtək(ə)l/ | parçacık |
| gamma isim | /ˈɡæ.mə/ | gama |
| alpha isim | /ˈæl.fə/ | alfa |
| beta isim | /ˈbeɪtə/ | beta |
| stable isim | /ˈsteɪ.bəl/ | ahır |
| element isim | /ˈɛləmənt/ | öğe, eleman |
| bonus isim | /ˈbəʊ.nəs/ | bonus, ekstra |
| congratulations | /kənˌɡɹæt͡ʃəˈleɪʃ(ə)nz/ | tebrikler, tebrik ederim |
| exit isim | /ˈɛɡzət/ | çekilme, çıkış |
| pretend fiil | /pɹəˈtɛnd/ | numara yapmak, rol yapmak |
| galaxy isim | /ˈɡæl.ək.si/ | galaksi, gök ada |
| substance isim | /ˈsʌbstəns/ | madde |
Dikkat edilecek telaffuzlar
- “sh” ve “zh” sesleri: radiation /ˌɹeɪ.diˈeɪ.ʃən/, congratulations /kənˌɡɹæt͡ʃəˈleɪʃ(ə)nz/, attraction /əˈtɹækʃn̩/, fraction /ˈfɹæk.ʃən/
- Uzun kelimeler — vurguyu doğru yere koyun: radiation /ˌɹeɪ.diˈeɪ.ʃən/, radioactive /ˌɹeɪdioʊˈæktɪv/, congratulations /kənˌɡɹæt͡ʃəˈleɪʃ(ə)nz/, periodic /ˌpɪɹiˈɑdɪk/, microscopic /ˌmaɪ.kɹəˈskɑ.pɪk/
Bu videoyla nasıl çalışılır
- Videonun tamamını konuşmadan bir kez dinleyin ve bilmediğiniz kelimeleri not edin.
- 0,75× hızla başlayın, cümle cümle tekrar edin ve kolaylaşınca normal hıza dönün.
- Kendinizi kaydedin ve orijinaliyle karşılaştırın; atom, radiation, radioactive gibi kelimelere özellikle dikkat edin.
Gölgeleme Tekniği Nedir?
Gölgeleme, başlangıçta profesyonel tercüman eğitimi için geliştirilen ve çok dilli Dr. Alexander Arguelles tarafından popüler hale getirilen, bilim destekli bir dil öğrenme tekniğidir. Yöntem basit ama güçlüdür: ana dili İngilizce olan bir sesi dinler ve hemen yüksek sesle tekrar edersiniz — konuşmacıyı 1-2 saniye gecikmeyle takip eden bir gölge gibi. Pasif dinleme veya dilbilgisi alıştırmalarının aksine, gölgeleme beyninizi ve ağız kaslarınızı gerçek konuşma kalıplarını eşzamanlı olarak işlemeye ve yeniden üretmeye zorlar. Araştırmalar, telaffuz doğruluğu, tonlama, ritim, bağlı konuşma, dinleme anlama ve konuşma akıcılığını önemli ölçüde geliştirdiğini göstermektedir — bu da onu IELTS Konuşma hazırlığı ve gerçek dünya İngilizce iletişimi için en etkili yöntemlerden biri yapar.