目前用于测量α衰变率的方法主要有α-γ符合,-π计数,小立体角计数、液体闪 烁计数及电离室等测量装置。这些方法各有其优缺点。电离室作为一种经典而又可靠的设备,早已用于α放射性强度的相对及绝对测量。对于核素(特别是锕系元素核素)的α放射性的能量一般为4—9MeV。电离室对于这种能量范围的α粒子的探测效率是相同的。因此在这种情况下测量,电离室是十分方便和有利的。但对于高准确度的测 Currently used to measure the rate of α decay methods are α-γ coincidence, -π count, small solid angle count, liquid scintillation counting and ionization chamber and other measuring devices. Each of these methods has its advantages and disadvantages. As a classic and reliable device, ionization chamber has long been used for relative and absolute measurement of alpha radioactivity. The alpha radioactivity for nuclides (especially actinide nuclides) is generally 4-9 MeV. The detection efficiency of the ionization chamber for alpha particles of this energy range is the same. It is therefore very convenient and advantageous to measure the ionization chamber in this case. But for the high accuracy of the test