Introduction

The Model 9DP-1 is a digital, hand-held pressurized ion chamber that provides
highly sensitive exposure measurements of gamma and x-ray radiation at
energies above 25 keV and beta radiation at energies above 1 MeV. This meter is
specially designed for radiography work where pulsed fields are being measured.
It correctly integrates 50 ns pulses (and wider) that other systems typically miss
or measure inaccurately. Another feature of this instrument is that the detector
chamber is only pressurized to 2.5 atm (22 psig), thus avoiding all (USA) HAZMAT
concerns for shipping and handling. However, this reduced pressure also reduces
sensitivity, so the minimum “good” measurement point is 2 µSv/h (200 µR/hr)

Features