SLAID POWERPOINT TAJUK BAHAN RADIOAKTIF
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TENAGA NUKLEAR
Bahan Radioaktif
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Yang manakah simbol bagi bahan radioaktif??
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Bahan Radioaktif
• Bahan yang mengandungi atom-atom dengan nukleus yang tidak stabil
• Ia cenderung mereput dan memancarkan sinaranradioaktif
• Contoh: • Radium-226• Karbon-14• Kobalt-60• Iodin-131
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Proses Pereputan Nukleus
Pereputan radioaktif berlaku secaraspontan dan rawak
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Sinaran Radioaktif
• Sinaran boleh dikesan dengan;• (a) tiub pembilang Geiger-Muller• (b) dosimeter• (c) Kebuk awan• (d) Elektroskop
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Perbandingan Sinaran Radioaktif
JenisSifat
SinaranAlfa(α) Beta(β) Gama(γ)
Jenis zarah Nukleus helium Elektron Gelombangelektromagnet
Jenis cas positif negatif NeutralKelajuan 10% daripada
halaju cahaya90% daripada halaju cahaya
Sama dengan halaju cahaya
Kuasapenembusan
Lemah dan dapat dihalang oleh sehelai kertas
Kuat dan dapatdihalang olehAluminium setebal 5 mm
Paling kuat, hanya dapat dihalang oleh plumbum dan konkrit tebal
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Perbandingan Sinaran Radioaktif
JenisSifat
Sinaran
Alfa(α) Beta(β) Gama(γ)
Kesan medanElektrik
Runut
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Kesan Medan Magnet terhadap sinaran radioaktif
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Percubaan Sabah 20106. Diagram 6.1 shows an experiment to study the penetrating power of beta ray. Rajah 6 menunjukkan satu eksperimen mengkaji kuasa penembusan sinar beta.
Diagram 6.1 Rajah 6.1 From the observation, the beta ray is blocked by material Q but can penetrate material P. Berdasarkan pemerhatian, sinar beta dapat dihalang oleh bahan Q tetapi dapat menembusi bahan P.
(a) Name material Namakan bahan
P:_______________________________________________________________________
Q:_______________________________________________________________________
[2 marks] [2 markah]
Sehelai Kertas
Kepingan aluminium
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(b) Give one characteristic of beta ray Berikan satu ciri sinar beta.
__________________________________________________________________[1 mark] [1 markah]
(c) Explain why alpha ray cannot be used to measure the thickness of paper in industryTerangkan kenapa sinar alfa tidak boleh digunakan untuk mengukur ketebalan kertas dalam industri
__________________________________________________________________[1 mark] [1 markah]
(d) State the use of gamma ray in medicine.Nyatakan kegunaan sinar gamma dalam perubatan.
__________________________________________________________________[1 mark] [1 markah]
Kuasa penembusan sederhana / bercas negetif / kuasa pengionan sederhana
Kuasa penembusan lemah
Mensteril alatan pembedahan
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Carbon-14
Karbon-14Iodine-31
Iodin-131Cobalt-60
Kobalt-60Phosphorus-32Fosforus-32
(e) Diagram 6.2 shows the use of radioisotopes to study the absorption of fertiliser by a plant roots.Rajah 2 menunjukkan kegunaan radioisotope untuk mengkaji penyerapan baja oleh akar tumbuhan.
Mark ( √ ) the radioisotopes that is used in the box provided.Tandakan ( √ ) radioisotop yang digunakan dalam petak disediakan.
Diagram 6.2 Rajah 6.2
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Percubaan Pahang 2010
Bahan radioaktif / uranium
Menjana tenaga eletrik / mensteril alatan pembedahan
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Negatif
Positif
Alfa bercas positif tertarik kepada plat bercas negatif dan Beta bercas negatif tertarik kepada plat bercas positif
Mensteril peralatan pembedahan / Merawat kanser
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Percubaan Perak 2010
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Alfa
Gamma
Beta
Positif
Mengesan ketebalan logam
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