# Radioactive Decay

Experiment reportRadioactive decaySubject: physics
Group No.: 1-2A
Student No.: SH-10-0730G
Student Chinese Name: ??Student Name (Pinyin): Gu Weichen
Student English Name: Bill
Teacher Name: Channa Phillip
Date: 2011-3-18 Title | Introduction | Apparatus and Method | Measurements | Processing | Discussion |
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Conclusion | References | English | Total | Comments |
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Experiment reportRadioactive decayNAME: Bill
PIN YIN: Gu Weichen
PERSON ID: SH-10-0730G
CLASS NUMBER: ENG 1-2AIntroduction
Aim:
1. Simulate radioactive decay in the Excel to get the decay constant.
2. Find the ? which is the radioactive decay constant.
3. Analyze the error between the theoretical value of decay constant and experimental value of decay constant.Material:
Laptop, Microsoft Office ExcelTheory:
Half-life is the period of time, for a substance undergoing decay, to decrease by half.
A=-dNdt
-dNdt=?N
NN-dNN=-0t?*dt
lnN-lnN0=-?t
lnNN0=-?t
e-?t=NN0
Nt=N0e-?t
N02=N0e-?t1/2
12=e?t1/2
ln2=?t1/2
?=ln2t1/2Where A is activity; N0 is the initial quantity of the nuclei; Nt is the quantity that the nuclei still remains and has not decayed after the time t; ? is the decay constant; t1/2 is the half-life of the nuclei.History:
Radioactivity was found by Becquerel in 1896 who won the Nobel Prize. He noticed the radioactivity by accident that uranium salt crystals can release a radiation to the photographic plate even it is covered in the box. Finally he found out the radioactivity.Method
Steps:
1. Choose an element as the investigate substance from the Periodic Table and find the half-life. For example, silver (Ag108) and half-life of 418 years.
2. Open radioactive decay simulation program in the Excel and put the half-life into the Excel and get the decay constant.
3. Choose three different initial numbers of nuclei which range from 1~20, 100~1000 and…