CHP Practice Questions - Certified Health Physicist (CHP) Exam

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A Geiger-Mueller detector reads 500 counts per minute at a known dose rate of 2 mR/hr. After exposure to a much higher radiation field, the instrument reads zero. What is the MOST likely cause?

The detector has experienced saturation or dead-time paralysis The instrument is functioning correctly and the field is zero The radioactive source has completely decayed The battery has failed

Correct Answer:

The detector has experienced saturation or dead-time paralysis

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