RADIATION SAFETY SURVEYS
by schmidy — last modified Oct 10, 2007 09:02 PM
- Contamination can be detected by using an appropriate survey meter to scan the suspect area or by conducting a wipe test of the surface and counting it for radioactivity in a suitable counter.
- If appropriate, Geiger Mueller surveys must be performed after each use of radioactive material. Isotope storage areas must be surveyed monthly. Records of those surveys must be documented and available for review by the Radiation Safety Office. Radiation exposures to unrestricted areas must be maintained to less than 2 mR/hr. Appropriate shielding must be used if the exposure rate is greater than 2 mR/hr.
- Contamination wipe tests must be conducted and recorded monthly. For activities greater than 1 mCi per single use, wipes must be performed after each use of radioactive material. Records of the wipe tests must be documented and available for review by the Radiation Safety Office. The wipe tests results shall be recorded in disintegrations per minute (DPM). DPM is derived from the formula CPM (counts per minute) divided by the instrument efficiency. Any contamination greater than 200 dpm for Iodine or 2000 dpm for any other nuclide must be cleaned.
- If radioactive material is not used during a particular time period, records of inactivity must be documented and available for review by the Radiation Safety Office.
- Each individual who uses radioactivity is personally responsible for checking the area of use for contamination prior to leaving the controlled radioisotope areas. Additionally, each individual user is responsible for checking herself/himself for contamination of clothing, shoes and hands prior to leaving the controlled radioisotope areas.
- The results of the surveys shall be kept in a log book for review by the Radiation Safety Office and/or regulatory officials. The log entry shall reflect the model number and the serial number of the instrument used in the survey, also the date the survey was done and initials of surveyor.
- When contemplating purchase of a new or replacement instrument, check with the Radiation Safety Office for suggestions and minimum acceptable specifications for the intended use of the instrument. Survey meters are required to be recalibrated by the Radiation Safety Office on an annual basis.
- In the event personal clothing is contaminated, remove the clothing as quickly as possible, store in a plastic bag, seal the bag and mark the bag with a "Radioactive Material" label, sticker or flow pen, listing the isotope, ate and time of the incident, as appropriate. As soon as practical, phone the Radiation Safety Office, (852-5231), with pertinent information and await assistance from Radiation Safety personnel.