氡子体探测效率的测定

Determination for Radon Daughter Efficiency

在放射性测量中,应该用待测核素的标准源测定其探测效率,然而,氡子体短半衰期衰变的特点无法制备其标准源,国内外至今还是个有待解决的问题。本文详细介绍了现场抽取氡子体样品测定其效率的新方法。假定源与探测器距离为零射,探测器对各种能量α粒子的效率均相同,则根据放射性衰变规律,由对标准源的效率就能计算出氡子体的探测效率。本文首次提出了解决这一难题的好办法,并已在实际工作中得到广泛应用。

It is known that the detection efficiency must be measured with a standard source of corresponding nuclear element. But it is very difficult for radon daughter because the standard source is not available for short halflife. This paper details a new method for measuring the efficiency of radon daughter by means of a field sample. Assuming that the detection efficiencies for a-particles of different energies are equal when the distances between the detector and the source are zero, we can calculate the detec...