Here's the step-by-step process for performing a wipe test in radiography:
1. Preparation:
- Ensure that the area to be tested is free of any loose radioactive sources or contamination.
- Put on appropriate personal protective equipment (PPE), such as gloves and dosimetry badges, to minimize radiation exposure.
2. Wipe Sampling:
- Choose appropriate wipe material, typically cotton swabs or filter paper, based on the surface to be tested.
- Wet the wipe material with a suitable solvent or water, if necessary.
- Gently wipe the designated areas or surfaces, applying light pressure to ensure effective sample collection.
- Allow the wipe material to dry completely.
3. Measurement:
- Place the dried wipe sample inside a designated counting container or directly onto the radiation detection instrument.
- Use a suitable radiation detection instrument, such as a Geiger-Müller counter or scintillation counter, to measure the radioactivity levels present on the wipe sample.
- Record the measurement results and compare them with the established limits or thresholds for radioactive contamination.
4. Interpretation:
- If the radioactivity levels measured on the wipe sample exceed the permissible limits, it indicates the presence of radioactive contamination.
- Further investigation and decontamination procedures should be carried out to identify and remove the source of contamination.
- Regular wipe tests help ensure that radiographic equipment and work areas remain free from radioactive contamination, minimizing the risk of radiation exposure to personnel and the environment.
Wipe tests are an important part of a comprehensive radiation safety program in radiography. They are regularly conducted to monitor and maintain a safe working environment, protecting both workers and the general public from unnecessary radiation exposure.