蒸压加气混凝土砌块辐射防护屏蔽性能试验研究

本文利用相同管电流(25mA)不同管电压(70kV～120kV)下产生的X射线,对国内4种常用蒸压加气混凝土砌块样品进行照射,并测量射线穿过每种样品后固定点位处的空气吸收剂量率。研究得出:(1)在70kV～120kV条件下,蒸压加气混凝土砌块的等效铅当量厚度随着管电压的增加出现先增加后减小的变化趋势,在90kV时达到最大;(2)4种蒸压加气混凝土砌块的等效铅当量厚度均大于1.0mm,部分射线装置机房可选用蒸压加气混凝土作为辐射防护材料;(3)蒸压加气混凝土砌块的等效铅当量厚度与材料的干密度、厚度有关,与抗压强度无关,材料的干密度越大、材料厚度越大,等效铅当量厚度越高。

Experimental research on radiation protection shielding performance of autoclaved aerated concrete blocks

In this paper,using X-rays generated at different tube voltages( 70 kV to 120 kV) with the same tube current( 25 mA),four commonly used autoclaved aerated concrete block samples in China were irradiated and the air absorption dose rate was measured at the fixed point after the X-rays passed through each sample.The results show that:(1) the equivalent lead equivalent thickness of autoclaved aerated concrete block under the condition of 70 kV to 120 kV increases first and then decreases with the increase of tube voltage,reaching the maximum at 90 kV;(2) the equivalent lead equivalent thickness of four kinds of autoclaved aerated concrete blocks is more than 1. 0 mm,and autoclaved aerated concrete can be used as radiation protection material in some machine rooms;(3) the equivalent lead equivalent thickness of autoclaved aerated concrete block is related to the dry density and thickness of the material,which is independent of compressive strength.