Method for measuring alpha decay detection efficiency of 222Rn and 220Rn daughters

Abstract

The invention discloses a method for measuring the alpha decay detection efficiency of 222Rn and 220Rn daughters. According to the method, after barrier films with different thicknesses are added to the surfaces of three solid-state nuclear track detectors respectively, the alpha decay detection efficiency of different daughters of 222Rn and 220Rn is measured; for the 222Rn daughters, the solid-state nuclear track detectors mainly measure alpha particles generating energy during decay of 218Po and 214Po is 6 MeV and 7.69 MeV; for the 220Rn daughters, the solid-state nuclear track detectors mainly measure alpha particles generating energy during decay of 212Bi and 212Po is 6.05 MeV and 8.78 MeV. By means of the method, the alpha decay detection efficiency of different daughters of 222Rn and 220Rn is measured, the whole measuring process and the calculation method are simple, and the alpha decay detection efficiency of the daughters of 222Rn and 220Rn can be obtained quickly.

Description

technical field [0001] The invention relates to the technical field of nuclear radiation detection, in particular to a method for detecting radiation after coating the surface of a solid nuclear track detector. 222 Rn, 220 A method for calibrating the detection efficiency of Rn daughter α decay. Background technique [0002] in the air 222 Rn, 220 Rn is the main source of natural radiation received by human beings. 222 Rn, 220 The daughter body of Rn is deposited in the respiratory system, and the high-energy α particles emitted by its further decay cause damage to human cells. in the air 222 Rn, 220 The measurement of daughters of Rn generally adopts filter membrane sampling, and then obtains the concentration of different daughters by energy spectrum measurement, but this method can only obtain the concentration of daughters with a short sampling time. The solid state nuclear track detector can be used to measure 222 Rn, 220 Concentrations of Rn from several days...

AI Technical Summary

Problems solved by technology

in the air 222 Rn, 220 The daughter body measurement of Rn generally adopts filter membrane sampling, and then obtains the concentration of different daughter bodies by energy spectrum measurement, but this method can only obtain the daughter body concentration of a shorter sampling time

The solid state nuclear track detector can be used to measure 222 Rn, 220 Concentrations of Rn from several days to hundreds of days, but conventional measurement methods cannot distinguish 222 Rn, 220 Rn and its daughters

Currently, according to 222 Rn, 220 The energy of the daughter bodies of Rn is different. Some researchers have begun to use the method of adding film barriers on the surface of solid nuclear track detectors to identify energy. 222 Rn, 220 Rn daughter α decay detection efficiency is calibrated, but the existing calibration method is relatively complicated

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