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MODUL • Fizik TINGKATAN 5

• Ada kalanya, nuklid anak yang terhasil daripada reputan radioaktif masih tidak stabil.
Sometimes, the daughter nuclide resulted from radioactive decay is still unstable.
• Nuklid anak tersebut akan terus mereput melalui beberapa siri reputan sehingga
Huraikan siri reputan radioaktif menghasilkan nuklid anak yang paling stabil.
Describe radioactive decay series The daughter nuclide will continue to decay through a series of decays until it produces the
most stable daughter nuclide.
• Dalam setiap proses reputan mungkin menghasilkan zarah alfa, zarah beta dan gama.
In each process of decay , it may produce alpha particles, beta particles and gamma.

Contoh siri reputan radioaktif / Example of radioactive decay series

238 U
Pa
234 U

230
Ra
226
222
87 88 89 90 91 92
Reputan kali ke- Persamaan reputan Keterangan
The decay time Equation of decay Explanation

234
Th
Pertama 238 U → Th + He 90
234
4
First 92 90 2 masih tidak stabil dan akan terus mereput
is still unstable and continues to decay
234
Pa
91
Kedua 234 Th → Pa + e
234
0
Second 90 91 –1 masih tidak stabil dan akan terus mereput
is still unstable and continues to decay
234
U
92
Ketiga 234 Pa → U + e UNIT 5
234
0
Third 91 92 –1 masih tidak stabil dan akan terus mereput
UNIT 5
is still unstable and continues to decay
230
Th
90
Keempat 234 U → Th + He
230
4
Fourth 92 90 2 masih tidak stabil dan akan terus mereput
is still unstable and continues to decay
226
Ra
Kelima 230 Th → Ra + He 88
226
4
Fith 90 88 2 adalah paling stabil dan reputan berhenti
its the most stable and the decay stop
Siri reputan radioaktif ini menghasilkan 3 zarah alfa dan 2 zarah beta
This radioactive decay series produce 3 alpha particles and 2 beta particles

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