Dose test device for long-distance horizontal irradiation

The invention discloses a dose test device for long-distance horizontal irradiation. The dose test device includes a water tank, a water tank supporting platform and an ionization chamber adapter; the water tank supporting platform is provided with water tank slide rails; the water tank can slide up and down along the water tank slide rails; ionization chamber slide rails are arranged in the water tank; the ionization chamber adapter can slide in a front-back manner along the ionization chamber slide rails; the front wall of the water tank is provided with a window; and a thin plate is installed in the window. When irradiation dose testing is performed, an end surface of an accelerator tray end or a radiation source is arranged before the water tank, and the ionization chamber adapter can slide in a front-back manner along the ionization chamber slide rails, and therefore, measurement of doses of different depths in a horizontal direction can be realized; the side surface of the water tank is provided with the window, and the thin plate is installed in the window, and a plane-parallel ionization chamber can approach the thin plate, and therefore, measurement of doses of approximate surfaces along a horizontal direction can be realized; the water tank can slide up and down along the water tank slide rails, so that the long-distance horizontal irradiation dose test device can be applied to measurement use of different height positions. With the dose test device of the invention adopted, dose measurement in long-distance horizontal irradiation such as total body irradiation can be realized conveniently.