First, collect data without the sample. You can start the measurement by pushing the[br]‘START’ button. The number of radioactive particles detected by the G-M tube[br]can be seen on the display. The process is accelerated therefor the originally[br]5-minute-long experiment lasts a considerably shorter time. You can stop the[br]simulation by pushing the ‘STOP’ button. The ‘RESET’ button takes you back to[br]beginning of the experiment.[br][br]Then place the sample under the sensor. You can start the measurement again by pushing the[br]‘START’ button. The display now shows the number of particles coming from both the[br]background radiation and the sample.[br][br][br][br]

Measure the number of hits in time periods of 30 seconds first without, then with the[br]sample. Use the clock of the simulation for timing. Gather the measured[br]figures in a table. Find the number of radioactive particles caused by the[br]sample by subtracting the number of detected background radiation particles[br]from the total hits. Plot the number of hits in every 30 seconds as a function of[br]time. Estimate the half-life of the sample.[br][br][br]