alph - appa
- alpha (alpha-particle activity) activity
- alpha counter
- alpha detector; alpha-particle det.; alpha-radiation detector
- alpha disintegration
- alpha(-particle) decay
- alpha(-particle) emission
- alpha(-particle) radiation
- alpha(-particle) recoil tracks
- alpha-Wenner system
- Alpin's sonde
- alternate design
- alternate joints
- alternate materials
- alternate pick
- alternating (current)
- alternating current demagnetization
- alternating current motor
- alternating dipole
- alternating electric dipole
- alternating field demagnetization
- alternating magnetic dipole
- alternating magnetic field
- alternating motion
- alternating-current measurement
- alternation of beds
- altimetric correction
- altitude mark
- altitude recorder
- alumina cement
- alumina; aluminum oxide
- aluminum detonator
- aluminum dust
- aluminum electrode
- aluminum lead-azide detonator
- AM recorder
- AM recording
- amalgam electrode
- ambient conditions effect
- ambient magnetic field
- ambient noise
