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Listening Quiz: Yêu Cầu Bảo Vệ cho Nguồn Phóng Xạ – Medium Level
Th3 10, 2024
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bởi
Anna Phạm
trong
Tiếng Anh dành cho Nhà vật lý học (English for Physicist)
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1.
What are David and Emily mainly discussing?
A schedule for worker training sessions
A plan for shielding a radiation source
The purchase of cobalt-60 for a laboratory
The repair of concrete walls in the building
Explanation:
They discuss the source strength, distance, exposure time, and the need for lead or concrete shielding to protect workers.
2.
How strong is the radiation source David mentions?
5 centimeters
5 curies
10 curies
30 curies
Explanation:
David says, ‘It is a cobalt-60 source with 10 curies.’
3.
How far away is the working area from the radiation source?
5 centimeters
10 meters
30 meters
5 meters
Explanation:
David states, ‘The working area is 5 meters away.’
4.
Why does Emily say they need thick lead shielding?
Because the workers will be away from the source for only a few seconds
Because concrete walls are not available at the site
Because the source is strong and the workers are relatively close to it
Because the source is located 30 meters away
Explanation:
Emily says this after hearing that the source is 10 curies and the working area is 5 meters away, so the shielding needs to be strong.
5.
Why does Emily say, ‘I will prepare the shielding plan now’?
To ask David to move the working area farther away
To indicate she will start organizing the shielding measures
To show that she has finished all calculations already
To suggest replacing the cobalt-60 source immediately
Explanation:
After discussing shielding materials, dose calculation, and cost, Emily says she will prepare the shielding plan now, meaning she will begin organizing the plan.
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