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Physics for Biosciences Laboratory

Faculty of Science, UOIT

Lab Report PB-05: Radioactivity Student’s name

CRN72890

Radioactivity - Distance 1. Vacuum is on Americium graph

Table 1.1 - Intensity of Radiation of Americium in Vacuum Bismuth 210 graph

Lab Report PB-05: Radioactivity

Date March 29, 2020

Physics for Biosciences Laboratory

Faculty of Science, UOIT

Table 1.2 - Intensity of Radiation of Bismuth 210 in Vacuum Cobalt 60graph

Table 1.3 - Intensity of Radiation Cobalt 60 in Vacuum 2. Air is on Americium graph

Table 2.1 - Intensity of Radiation of Americium in Air

Lab Report PB-05: Radioactivity

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Physics for Biosciences Laboratory

Faculty of Science, UOIT

Bismuth 210 graph

Table 2.2 - Intensity of Radiation of Bismuth 210 in Air

Cobalt 60 graph

Table 2.3 - Intensity of Radiation Cobalt 60 in Air

Lab Report PB-05: Radioactivity

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Physics for Biosciences Laboratory

Faculty of Science, UOIT

Radioactivity – Penetration Americium 241 graph

Table 3.1 - Ionizing Radiation of Americium 241 in a Vacuum

Radium 226 graph

Table 3.2 - Ionizing Radiation of Radium 226 in a Vacuum

Lab Report PB-05: Radioactivity

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Physics for Biosciences Laboratory

Faculty of Science, UOIT

Bismuth 210 graph

Table 3.3 - Ionizing Radiation Bismuth 210 in a Vacuum

Thorium 234 graph

Table 3.4 - Ionizing Radiation Thorium 234 in a Vacuum

Lab Report PB-05: Radioactivity

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Physics for Biosciences Laboratory

Faculty of Science, UOIT

Cesium 137 graph

Table 3.5 - Ionizing of Radiation of Cesium 137 in a Vacuum

Cobalt 60 graph

Table 3.6 - Ionizing of Radiation of Cobalt 60 in a Vacuum

List the alpha, beta and gamma emitters from least to most penetrating:

1. Alpha Source - Americium 241and Radium 226 2. Beta Source. - Bismuth 210 and Thorium 234 3. Gamma Source - Cesium 137 and Cobalt 60 Lab Report PB-05: Radioactivity

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Physics for Biosciences Laboratory

Faculty of Science, UOIT

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Analysis: After analyzing the data obtained, we can come to the conclusion that the samples of the Alpha emitters emitted radiation that expressed similar penetration abilities. Beta and Gamma rays on the other hand display different penetrating abilities. Gamma rays penetrate in greater depths because they can pass through the space between atoms and molecules as shown in table 3.5 and 3.6. The range of Beta emitters depend on their speed; Conclusion: The purpose of this lab is to observe the effects of air intensity radiation and the effect of the various radioactive sources – alpha, beta and gamma particles at different distances. Part one and two of this experiment, examines the effect if air on the intensity of radiation from Alpha (α) particles, Beta (β) particles and Gamma (γ) rays at various distances (10mm, 20mm, 40mm, 60mm, 80mm) were observed. The results obtained observes radiation decay per minute. Inverse Square Law (S/4πr2) supports the inversely proportional relationship displayed. Inverse Square law says that intensity equals the inverse of square of the distance from the source. For example, the radiation exposure from a point source gets smaller the farther away it is. This was shown in our results as distance increased there was a decrease in the number of counts. The medium of the air has no effect on the intensity of ionizing radiation. Part three of this experiment examines the penetrating abilities of ionizing radiations from Alpha (α) particles, Beta (β) particles and Gamma (γ) rays at various distances (10mm, 20mm, 40mm, 60mm, 80mm) were observed. According to tables 3.1 and 3.2, we can see that the alpha emitters experienced the same amount of penetration. We can see that when there is an increase in thickness of absorbers there is a decrease in the number of counts per minute. Whereas, Beta and gamma emitters emitted radiation that illustrates different penetrations. Gamma particles have the ability to penetrate through large depths in materials. Beta emitters can are dependent on speed.

We can conclude that Alpha (α) particles, Beta (β) particles and Gamma (γ) rays all exhibit different penetrations, but gamma rays have the strongest penetration ability and alpha rays exhibit the weakest penetration ability.

Lab Report PB-05: Radioactivity

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