Question Detail

PHY 104 PHY 104 Past Questions Objective Question
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Question

A scientist needs to use a source of gamma rays as safely as possible. Which action will not reduce the amount of radiation that reaches the scientist?
Options
A keeping the distance between the source and the scientist as large as possible
B keeping the temperature of the source as low as possible
Correct Answer
C keeping the time for which the scientist uses the source as small as possible
D placing a lead screen between the scientist and the source
Correct Answer

Option B is the correct answer.

Detailed Explanation

The intensity of radiation decreases with distance (inverse square law), is reduced by shielding (lead), and total exposure depends on time (dose = rate × time). The temperature of the source does not affect the amount of radiation emitted for gamma sources; radioactive decay is a nuclear process independent of temperature.

Hint

Consider which factor does not affect the rate of radioactive decay or the intensity of radiation reaching the scientist.

Question Info

Course: PHY 104
Topic: PHY 104 Past Questions
Type: Objective
Difficulty: Not specified
Question 781 of 947
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