Reduce background radiation more than 10 times with the environmental shield. Fitting any Capintec CRC dose calibrator with a remote ionization chamber, the shields consists of 9 interlocking lead rings that surround the chamber. Uniform wall thickness (4 cm standard, or 1 1/2”) also reduces radiation exposure during calibration. The lead contains 3% antimony for added strength. For use with CRC-25R, CRC-25W, CRC-712M, and CRC® Ultra.