Apparatus for measuring radon and thoron by using ionization chamber

An apparatus for measuring radon and thoron using an ionization chamber, the apparatus comprising:

• a pump for air inflow suctioning and sending external air to a first gas line having a predetermined length;
• a sensor module receiving the air sent from the pump for air inflow through the first gas line, outputs the air to a second gas line having a predetermined length, and outputting an alpha particle detection signal of an electrical signal by detecting alpha (α) particles discharged from radon and thoron included in the air flowing in an ionization chamber having a predetermined size through the first gas line;
• an air valve installed in the second gas line and operating in response to an external control signal to discharge the air sent through the second gas line or stop the gas;
• and
• a control module outputting a control signal to open the air valve while outputting a control signal to operate the pump for air inflow for a predetermined operation time, and then discriminating normal or abnormal alpha particle detection signals by receiving in real time an alpha particle detection signal of an electrical signal output from the sensor module and by comparing and analyzing a waveform with a signal pattern information data according to external noise signal types stored in advance;
• counting the normal alpha particle detection signal discriminated for a predetermined measurement time;
• calculating a first radioactive ray concentration value on the basis of the counted number of times of the normal alpha particle detection signals;
• outputting a control signal to stop the pump for air inflow after the pump for air inflow is operated for a predetermined operation time while outputting a control signal to close the air valve;
• discriminating normal or abnormal alpha particle detection signals by waiting for a predetermined time and then receiving in real time an alpha particle detection signal of an electrical signal output from the sensor module and by comparing and analyzing a waveform with the signal pattern information data according to external noise signal types stored in advance;
• counting the normal alpha particle detection signal discriminated for a predetermined measurement time;
• and calculating a second radioactive ray concentration value on the basis of the counted number of times of the normal alpha particle detection signals.