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Related Experiment Video

Updated: Jul 19, 2026

A Basic Positron Emission Tomography System Constructed to Locate a Radioactive Source in a Bi-dimensional Space

A Basic Positron Emission Tomography System Constructed to Locate a Radioactive Source in a Bi-dimensional Space

Published on: February 1, 2016

HPGe virtual point detector for radioactive disk sources.

Z B Alfassi¹, N Lavi, O Presler

¹Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel. alfassi@bgumail.bgu.ac.il

Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine

|September 27, 2006

Summary

The virtual point detector model is valid for radioactive disk source measurements using HPGe detectors. This allows for reliable calibration curve adjustments based on source-detector distance and photon energy.

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Published on: March 29, 2016

Area of Science:

Nuclear physics
Radiation detection and measurement

Background:

High-purity germanium (HPGe) detectors are crucial for accurate radioactive source measurements.
Calibration of detectors is essential for quantifying radioactivity, but can be complex for extended sources like disks.
A virtual point detector model offers a simplified approach to radiation interaction modeling.

Purpose of the Study:

To validate the virtual point detector model for radioactive disk sources measured with HPGe detectors.
To establish a method for adjusting calibration curves for varying source-detector distances.
To investigate the influence of photon energy on the virtual detector's position.

Main Methods:

Experimental measurements using HPGe detectors and characterized radioactive disk sources.
Application and validation of the virtual point detector model.
Analysis of count rate correlations with source-detector face distance.
Study of the virtual plane detector to detector face distance dependence on photon energy.

Main Results:

The virtual point detector model demonstrated validity for radioactive disk sources.
A quantifiable correlation between count rates and distance was established, enabling calibration curve adjustments.
The dependence of the virtual detector's position on photon energy was characterized for different source radii.

Conclusions:

The virtual point detector model provides a robust framework for calibrating HPGe detectors with radioactive disk sources.
This model facilitates accurate extrapolation and interpolation of calibration data for diverse experimental setups.
Understanding the energy dependence of the virtual detector position enhances measurement precision.