RCAP-2 Ion Recoil Contamination Avoidance Package

• Battery-biased sample holder
• Electronically-controlled pressure regulator
• Reliable and easy to operate

The Ion Recoil Contamination Avoidance Package (RCAP-2) is an accessory for ORTEC’s ALPHA-ARIA Alpha Spectrometer (and most older model alpha spectrometers). It is intended for alpha spectroscopists quantifying radionuclides which may contaminate charged-particle (ULTRA™ or surface barrier) detectors by ion recoil.

To avoid recoil contamination, one can reduce the momentum of the positively-charged recoils by increasing the vacuum chamber pressure and negatively biasing the sample holders, to repel the ions from the detector.