Hp (10) Secondary Standard Chamber Type 34035

Plane-parallel ionization chamber for direct measurement of Hp(10) personal dose equivalent on a slab phantom

  • Vented sensitive volume of 10 cm³
  • Measures the Hp (10) personal dose equivalent directly
  • Suitable as a reference chamber for Hp (10) calibration

The parallel plate ionization chamber model 340351 is integrated into a slab phantom to measure the Hp(10) radiation protection measuring quantity directly.

The high performance chamber is designed to be used as a secondary standard chamber for calibration purposes. The beam calibration with the Hp(10) chamber makes it unnecessary to precisely determine the spectrum of the X-ray beam.

The chamber comes uncalibrated: a primary standard calibration by PTB, the German National Laboratory, is available.

The chamber set includes a phantom slab of 31 mm thickness with chamber assembly and an additional PMMA phantom slab of 120 mm thickness. Both sets available include an adapter cable to connect the chamber either to a dosemeter with M connector or with BNC connector and banana pin.

The Hp(10) chamber should be used in connection with a high quality dosemeter such as UNIDOS, UNIDOS E or UNIDOSwebline to ensure best performance.


1 Ankerhold, Ambrosi, Eberle - A chamber for determining the conventionally true value of Hp (10) and H*(10) nee- ded by calibration laboratories - Rad. Prot. Dos. Vol. 96, Nos 1-3, pp. 133 - 137 (2001), Nucl. Techn. Publishing

Type of product vented plane-parallel chamber
Application radiation protection measurement
Measuring quantities Hp(10) personal dose equivalent
Design not waterproof, vented
Nominal sensitive volume 10 cm³
Reference conditions 20 °C, 1013 hPa 65 % rel. humidity
Reference point chamber center, 13.5 mm
  below chamber surface or 15.5 mm below surface of integrated step cylinder
Nominal response 285 nC/Sv
Chamber voltage 400 V nominal
Leakage current ≤ ± 10 fA
Cable leakage ≤ 1 pC/(Gy·cm)

Materials and measures

Phantom material PMMA
Outer dimensions 300 mm x 300 mm
chamber assembly height 31 mm
additional slab phantom height 120 mm

Ranges of use

Chamber voltage ± (300 ... 500) V
Radiation quality (15 ... 1400) keV
Temperature (10 ... 40) °C
  (50 ... 104) °F
  (10 ... 80) %, max 20 g/m3
Humidity (10 ... 80) %, max 20 g/m3
Air pressure (700 ... 1060) hPa


PTB Primary standard calibration upon request
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