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我们的实验测定方法是:将有裂隙的圆柱形(直径9.5厘米,高9.5厘米)花岗岩样品置于钢罐内。样品的底面和侧面与钢罐内壁之间的狭窄间隙用水泥浆粘牢。样品的顶面与钢罐盖之间有0.6厘米的距离。罐盖有两个孔洞,一个与空气相通,另一孔洞连接FD-125型氡钍分析器闪烁室的进气口,闪烁室的出气口连接抽气泵。把钢罐固定在电磁振动台上,开动抽气泵,以流动的空气作为载气将样品罐内的氡钍射气连续携入测氡仪闪烁室,由定标器每分钟给出一个脉冲计数。
Our experimentally determined method is: Place a fractured cylindrical (9.5 cm in diameter, 9.5 cm in height) granite sample in a steel tank. The narrow gap between the underside and side of the sample and the inner wall of the steel tank is glued with grout. There is a distance of 0.6 cm between the top of the sample and the steel lid. The lid has two holes, one connected to the air and the other hole connected to the air inlet of the blinking chamber of the FD-125 type radon-thoron analyzer. The air outlet of the blinking chamber is connected to the air pump. The canister is fixed on an electromagnetic vibrating table, and the aspirating pump is started. The flowing air is used as a carrier gas to continuously carry the radon radon in the sample tank to the scintillation chamber of the radon meter, and a pulse count is given by the calibrator every minute .