COOLING DEVICE FOR LIVING BODY MAGNETOGRAPHIC DEVICE

PROBLEM TO BE SOLVED: To detect the blocking of an exhaust pipe by dew condensation of the air penetrated from the outside of the exhaust pipe and surely prevent an accident by providing a means for detecting the pressure of the coolant gas layer within a low-temperature thermostat and detecting the freezing blocking of the exhaust pipe. SOLUTION: A pressure gauge 7 is constituted so as to introduce the pressure of a coolant gas tank 25 through a pressure conduit 6 inserted into the inner tank 1a of a low-temperature thermostat 1 through a baffle 2. Even if the outside air is penetrated into an exhaust pipe 5 through the release port of the exhaust pipe 5, cooled by the low-temperature coolant gas leaving the low- temperature thermostat 1, and frozen by dew condensation and coagulation on the inner wall of the exhaust pipe 5 to block the exhaust pipe 5 after the lapse of a long period, the blocking can be found through the pressure gauge 7, and an alarm is given on the basis of this, whereby the breakage of the low-temperature thermostat 1 can be prevented, and the safety of this kind of living body magnetographic device can be enhanced. On the basis of the alarm, the frozen part of the exhaust pipe 5 is thawed.