A new G-M counter dead time model

Area of Science:

• Nuclear Instrumentation and Radiation Detection
• Physics

Background:

• Accurate dead time correction is crucial for Geiger-Müller (G-M) counters, especially at high counting rates.
• Existing paralyzable and non-paralyzable models have limitations in fully describing G-M counter behavior.

Purpose of the Study:

• To develop a hybrid dead time model for G-M counters that combines aspects of both paralyzable and non-paralyzable models.
• To validate the proposed model's accuracy in correcting observed counting rates.

Main Methods:

• A hybrid G-M counter dead time model was derived by integrating idealized paralyzable and non-paralyzable models.
• The model incorporates two key parameters: paralyzable and non-paralyzable dead times.
• Experimental validation was performed using a decaying 56Mn source and a G-M tube with a dead time of approximately 300 microseconds.

Main Results:

• The hybrid model demonstrated very good agreement (within 5%) between corrected and observed counting rates.
• The model's validity was confirmed for counting rates up to 7 x 10^4 counts/s.
• The derived dead times closely correlate with the physical dead time and resolving time of the G-M tube.

Conclusions:

• The developed hybrid G-M counter dead time model provides a more accurate method for dead time correction.
• This model is effective for high counting rate applications in nuclear instrumentation.
• The findings contribute to improved accuracy in radiation measurement using G-M counters.