GAMMA RADIATION METER SURVEY DESIGN GEIGER TUBE AND ARDUINO UNO MICROCONTROLLER BASED FOR ENVIRONMENTAL RADIATION MONITORING

• Main Author: Karsa Sondana, Deni
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/74578
• Institution: Institut Teknologi Bandung

Radioactivity that occurs in the environment produces ionizing radiation in the form of a, 13 and y radiation. Every time humans on earth are exposed to this radiation Nvhich, if given a certain amount, will cause damage to human body tissues. The exposure to ionizing radiation that every human receives in various places is not the same and cannot be felt directly by humans. The aim ofthis final project is to design a detector or survey meter for gamma radiation in the environment using a Geiger J305 tube filled with argon gas. The detector module is integrated with the Arduino UNO Microcontroller whose role is to convert the resulting electrical signal into count data in units of CPM (Counters per minutes). The value of the survey meter count using the Geiger working principle usually has random and changing values. To ensure changes in the value of the measurement results are not due to tool errors, a statistical stability test is carried out using the chi squere test. The trial results of measuring gamma radiation in the room obtained data with a chi squared value of 14.00. The results of the outdoor gamma radiation measurement trial obtained data with a chi squared value of 15.03. The trial results of measuring gamma radiation from a fixed radiation source, namely radionuclide Cessium-137, obtained data with a chi squared value of 12.84. From the results of the three test measurements carried out, all chi square test values are in the gaussian distribution range for 19 degrees of freedom and probability 0.90 to 0.10, which is 11.561 to 27.02. Based on the results of the data processing, it can be concluded that the gamma radiation survey meter that has been designed works well and has consistency in measuring gamma radiation. The design survey meter was also tested for comparison, namely comparing the measurement results with a similar survey meter which is the manufacturer's standard and has been calibrated by the National Research and Innovation Agency (BRIN). The standard survey meter that is used as a reference for the comparative test in this final project is the Inspector usb sn.45007. Comparison tests were carried out by measuring radionuclide radiation using both survey meters simultaneously. The results of the measurement ofcounts per minute (CPM) produced by the survey meter as a result of the design have better accuracy if the radiation is stronger or in the experiment the radiation source is placed at the closest distance. Through the comparative test it is also possible to find the conversion value of the survey meter design. The conversion value in question is the multiplier value for converting the counts per minute (cpm) value to the dose rate value in units of ItSv/hour. Through a comparative test by measuring radiation from a Cessium-137 radionuclide radiation source at a distance of 5 cm, the value of the conversion factor (fk) of the survey meter design was obtained at 0.003 liSv/hour/CPM. Making a survey meter to measure radiation in the environment can then be used as teaching material for physics in high school on the basic competencies of atomic nuclei and radioactivity with the title of the simple radiation meter survey teaching module.