Abstract: The structure and technical characteristics of T34035 H_p (10) secondary standard ionization chamber are introduced. The calibration coefficient NH and correction factor k(R, α) of H_p (10) secondary standard ionization chamber are measured. The uncertainty of the calibration coefficient N_H is 4.6% (k=2), and the uncertainty of the correction factor k(R, α) is 6% (k=2). When the radiation incident angle is less than 75 degrees, the energy response is better than ±20% in the range of 12 keV-1 250 keV, and the non-linearity of personal dose equivalent rate is better than ±3% in the range of 100 μSv/h-3 Sv/h. The k(R,α) values of some narrow spectrum N series and low air specific kinetic energy L series are simulated by MCNP5. The results show that the error between the calculated value and the measured value is within the range of ±6%. The ionization chamber meets the requirements of the secondary standard ionization chamber and can be used directly for the transmission of H_p (10) value.

Key words: H_p(10) secondary standard ionization chamber, calibration factor N_H, correction factor k(R,α)