Label counting vials with wipe test locations.
2. Use a cotton swab, glass fiber filter or Waterman paper, wipe
an area of ~100 cm2. You may moisten the
material used for wipe test.
3. Place the wipe to counting vials, add appropriate amount of
scintillation cocktail. Also prepare a vial with a clean swab/filter
as a control.
4. Count the radioactivity using a liquid scintillation counter.
5. If wipe test for an area is two times higher than the
background (control), clean the area and repeat the wipe test for