Survey meter

A survey meter for measuring a radioactive contamination caused in an inner surface of a pipe includes a radiation detecting section and a signal processing section. The radiation detecting section includes a rod-shaped light guide unit, a reflecting portion (4) connected to one end surface of the light guide unit, a photoelectric transfer unit (3), for outputting an electronic signal, connected to another one end surface of the light guide unit, and a scintillator unit (2) provided to a circumference of the light guide unit. The signal processing section (18) includes a pulse height discriminator (7) for outputting a logic signal at a time when a pulse height value of the electronic signal outputted from the photoelectric transfer unit is higher than a threshold value, a counter unit (8) for counting the logic signal, a contamination judging unit (9) for judging whether a radioactive contamination is caused or not, and a display unit (10) for displaying the value counted by the counter unit and a contamination judging result judged by the contamination judging unit.