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BADANIE OSŁABIENIA PROMIENIOWANIA GAMMA PRZY PRZEJŚCIU PRZEZ MATERIĘ |
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1. |
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Celem ćwiczenia było zapoznanie się ze zjawiskiem osłabienia promieniowania gamma przy przejściu przez materię. |
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Eksperyment wykonywany był wirtualnie. W tym celu użyta została aplikacja WAN GAMMA.exe, która zastępowała |
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rzeczywisty jednokanałowy spektrofotometr, spektrofotometrem wirtualnym. |
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Wykonywano kolejno pomiary widma, tła i absorpcji dla pierwiastka Cs (cez). |
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Przeprowadzane pomiary: |
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b) 13 pomiarów widma po 100sekund każdy |
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c)4 pomiary tła, każdy 100s |
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d) 8 pomiarów absorpcji dla miedzi i ołowiu oraz 4 dla srebra po 100 sekund każdy |
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e) grubość absorbentów 2,5,7,10,12,15,17,20(mm) dla Cu i Pb oraz 5,10,15,20 dla Al. |
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2. Tabelki z wynikami i wykersy. |
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Pomiar widma Cs |
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Pomiar tła |
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Pomiar absorpcji promieniowania |
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Pomiar absorpcji prom. |
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numer pomiaru |
Up [ V ] |
N (Up) |
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nr pomiaru |
Nt |
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grubość |
liczba zliczeń N(d) |
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grubość |
liczba zliczeń N(d) |
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1 |
2 |
1965 |
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1 |
595 |
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d [mm] |
Pb |
Cu |
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d [mm] |
Al. |
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2 |
2,5 |
1047 |
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2 |
526 |
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2 |
3357 |
3731 |
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5 |
3896 |
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3 |
3 |
810 |
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3 |
566 |
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5 |
2316 |
3262 |
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10 |
3477 |
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4 |
3,5 |
507 |
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4 |
564 |
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7 |
1845 |
2823 |
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15 |
3271 |
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5 |
4 |
154 |
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10 |
1339 |
2161 |
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20 |
2876 |
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6 |
4,2 |
159 |
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12 |
1084 |
2020 |
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7 |
4,4 |
275 |
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Poziom tła: |
562,75 |
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15 |
682 |
1668 |
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8 |
4,6 |
687 |
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17 |
551 |
1588 |
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9 |
4,8 |
1269 |
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20 |
382 |
1232 |
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10 |
5 |
1174 |
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11 |
5,2 |
505 |
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12 |
5,4 |
121 |
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liczba zliczeń |
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logarytm liczby zliczeń |
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13 |
5,6 |
21 |
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Al. |
Pb |
Cu |
Al. |
Pb |
Cu |
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3896 |
3357 |
3731 |
8,26770566476243 |
8,11880299698004 |
8,22443157322116 |
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3477 |
2316 |
3262 |
8,15392513200786 |
7,74759683869289 |
8,09009578318096 |
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3271 |
1845 |
2823 |
8,09285102753838 |
7,52023455647463 |
7,94555542825349 |
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2876 |
1339 |
2161 |
7,96415571884094 |
7,19967834569117 |
7,67832635650689 |
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1084 |
2020 |
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6,98841318199959 |
7,61085279039525 |
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682 |
1668 |
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6,52502965784346 |
7,41938058291869 |
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551 |
1588 |
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6,31173480915292 |
7,37023064180708 |
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382 |
1232 |
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5,94542060860658 |
7,11639414409347 |
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Wnioski. |
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Przedstwione na wykresach funkcje odpwiadają liniowym współczynnikom absobcji charakterystycznym dla danego absorbentu. |
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Przeprowadzone doświadczenie pokazało,że najlepszym absobentem, z banachych przez nas, jest ołów. |
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