Modeling Absorption of Radiation

Students use a Geiger counter to measure the radiation from a radioactive sample of Sr-90. They use the radiation absorption equation to predict the counts after one aluminum shield is used and find the counts are much higher than the prediction. After hypothesizing reasons why, they learn it is because the daughter product of Sr-90, Y-90, is radioactive and has higher energy beta particles. Students collect data from 4 more shields and determine the mass absorption coefficient of Y-90.

Grade Level: College • High School

Subject: Chemistry • Physics

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Wireless Geiger Counter | Get Started

Discover how the PASCO Wireless Geiger Counter (PS-3238) measures alpha, beta, and gamma radiation for use in experiments in shielding and the inverse square...

Featured Equipment

Radioactive Source (Sr-90)

This radioactive source is mounted in a 2.5 cm diameter sealed plastic disk and requires no licensing.

Wireless Geiger Counter

This Wireless Geiger Counter detects alpha, beta, and gamma ionizing radiation.

Wireless Geiger Counter with Sample Holder

This Wireless Geiger Counter detects alpha, beta, and gamma ionizing radiation. The included stand makes it easy to perform experiments on the inverse square law and radiation shielding.

Geiger Counter Sample Holder

Radioactive sample holder and shielding set for use with the PS-3238 Wireless Geiger Counter

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