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ITBS Level 14 Grade 8 Science 3
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Avg score: 62% Most missed: “The scientist also measures the mass of the particles. Which of the following ta…”

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A geologist has a sample containing fermium-253, a radioactive material. He measures the radioactive emissions from the sample once per day over a week and gets the data in this chart.

Day Radiation
1 2440 MBq
2 1920 MBq
3 1541 MBq
4 1218 MBq
5 970 MBq
6 770 MBq
7 611 MBq


(MBq stands for megabecquerels, a unit of radioactivity. The measurement in megabecquerels can be assumed to be proportional to the number of atoms remaining of the radioactive substance.)

ITBS Level 14 Grade 8 Science 3
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3 Questions

1. Which of the following is NOT a type of radiation that can be emitted in radioactive decay?
2. The scientist also measures the mass of the particles. Which of the following tables could show the results of this measurement?
3. The half-life of the radioactive material is the time it takes for half the radioactive atoms to decay. From the scientist's data, what is the approximate half-life of fermium-253?