The U24-D Tritium Monitor Control Chassis

femto-TECH has been widely regarded as an industry standard for tritium measurement & detection since the early 80's. The U24-D is a precision airborne beta radiation detection instrument that serves as a universal controller for our various sensing chamber offerings. The user can select between Glove Box, Room Monitor, Duct Monitor, Parallel Plate, and other custom configurations. Please see our Chambers page for more details.

The intrinsic calibration of the ion chamber used in a U24-D system is established by the physical size and geometry of the ion chamber being used and the value of the feedback resistor (high-meg). The National Institute of Standards and Technology (NIST) traceable tritium gas standards have been used to verify the electronic calibration factor for these types of ion chambers. Production ion chambers maintain the same parameters as those that have been calibrated with the tritium gas standard, therefore, the production ion chambers have the same intrinsic calibration. The feedback resistor of each production unit is measured once by the supplier of the resistors and a second time at femto-TECH. NIST traceable resistor standards and voltmeters are used to perform this measurement. A built-in electronic calibration adjustment provides field adjustment and calibration verification of all electronic components back to the feedback resistor. Field calibration checks can also be performed using a fixed geometry gamma source to provide a known amount of ionization in the ion chamber.