1. A valve within the M&M hydrostatic Bailer holds the differential pressure between the elevation of standing fluid level in the wellbore outside of the workstring and the fluid level inside the workstring.

2. Americium-241 is used commercially in applications such as smoke detectors, thickness gauges, and fluid level gauges.

3. The leakage test being over, the level of the flush fluid is considerably higher than a static fluid level, whereby said fluid flows by gravity through the shank (15) and removes the mud accumulated therein.