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探测慢中子常用的三氟化硼(BF
3
)正比计数管,其主要缺点是:脉冲幅度较低,应用温度范围较窄,抗γ本底辐射能力低(γ辐射最大本底一般不超过100R/hr)。自L. Colli与U. Fa
C
chini在1952年指出可以在电晕放电的本底上记录强电离粒子
[1]
以来,数种电晕放电慢中子计数管已投入了应用
[2][3]
。我厂也研制成功J701Z型电晕放电慢中子计数管(简称“电晕管”)。电晕管具有脉冲幅度高(可达数百mV),坪区范围宽(大于2kV),寿命长(几乎无限),热稳定性高(玻壳管可达200℃,金属陶瓷管可达300℃),在强γ本底辐射下工作稳定等优点。可应用于反应堆工程、石油勘探中的中子测井及中子测水分等慢中子测量仪器中。
The principle
structure and characteristic of a thermal neutron counter working in the corona discharge region are described. The influence of technology and operating conditions on the characteristics of the counter has been experimentally studied. The counter possesses such interesting advantages as lower operating voltage
wider length of plateau
higher pulse amplitude
the stability of heat
the applicability under strong radioactive
γ
background and a longer life.
L. Colli and U. Facchini , Phys. Rev. , 88 , 987 , ( 1952 ).
Ю. M. Толченов и В. T. Чайковский , ПТЭ , 6 , 5 ( 1963 ).
В Хрцсмов ц ∂p ., Докл. Болм. Ан. , 16 , 7 , 693 ( 1963 ).
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