(a) ALPHA PROBE TYPE AP 165
Alpha Probe type AP165 manufactured by NUCLEONIX is meant to be used along with Radiation Counting System model RC 605A for counting alpha samples. Radiation Counting System along with Alpha Probe essentially works as an Alpha Counting System.
Alpha Probe of NUCLEONIX make is essentially an integration of ZnS (Ag) scintillator screen, optically coupled to a 2” PMT & covered by a pin hole free aluminized mylar foil to provide, sealing against ambient light. Scintillations received by PMT because of Alpha particles will be converted to electrical charge and inturn to voltage pulses. Each of these events after amplification in the RCS will be counted. The required high voltage is applied (which is typically 900V) through RCS to the Alpha Probe.
Probe has a drawer assembly which facilitates sample placement on sample tray for counting applications. The counting samples are usually deposited on planchets of 25mm diameter or filter paper upto 38mm diameter.

Specifications

Detector material : Zns (Ag) Screen covered with Aluminized mylar foil.
Density : 10mg/cm²
Efficiency : Above 25% for U-238 alpha
Background counts / 600 sec. : Less than 5
Photomultiplier tube : PMT of ETL or Hamamatsu make or its equivalent.
Size : 50.8 dia (2")
Operating Voltage Range : 900 to 950V
Drawer Assembly : Holds both 25mm dia SS planchets or 50mm dia filter paper.

(c) Optional Accessories:
(i) Count Net - RS485 based networking software (for multiple systems network).
(ii) Data Communication Software : for data downloading from a single system.
(iii) Dot Matrix Printer : Radiation Counting System has a built-in centronics printer port, it can be directly connected to a printer. Data readings stored in the unit can be downloaded onto the printer (Care should be taken while choosing the printers not all printers are compatible. Please cosult Nucleonix systems for choosing your printer).