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An accurate and inexpensive gamma camera-based system for wipe testing

¹Department of Medical Imaging, University of Toronto, Sunnybrook Health Science Center, Ontario, Canada.

Journal of Nuclear Medicine Technology

|September 18, 1997

Summary

This study developed a gamma camera wipe test system for detecting radioactive contamination. The system offers an accurate, inexpensive, and convenient method for routine monitoring, meeting radiation safety regulations.

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Area of Science:

Medical Imaging
Radiation Safety
Nuclear Medicine

Background:

Radiation safety regulations mandate regular wipe testing to detect radioactive contamination.
Conventional wipe testing methods can be time-consuming and may lack sensitivity.

Purpose of the Study:

To develop and validate an accurate, convenient, and inexpensive method for performing wipe tests using a conventional gamma camera.
To enhance the sensitivity of gamma cameras for radioactive contamination detection.

Main Methods:

Modified a gamma camera collimator by creating an array of fifteen 3.2 x 3.2-cm holes to increase sensitivity.
Evaluated the system's sensitivity and minimum detectable activity (MDA) using various radioisotopes (99mTc, 111In, 67Ga, 201TI, 131I).

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Main Results:

The wipe testing system demonstrated sensitivities ranging from 2.5 to 4.3 counts per minute per Becquerel (cpm/Bq) for different isotopes.
Achieved a minimum detectable activity (MDA) below 35 Bq with a 2-minute counting time and an open-energy window for all tested isotopes.

Conclusions:

The developed gamma camera wipe test system is accurate, inexpensive, and easy to use.
This method effectively meets regulatory requirements for monitoring radioisotope contamination in nuclear medicine settings.