To provide a measuring service method capable of quickly measuring neutron fluence with precision, for evaluating group or personal dose of neutron radiation in an emergency.

Under a service contract with a facility possible to generate neutron radiation, to evaluate group/personal dose of neutron radiation in an emergency, an exposed gold foil 1 and a gold foil 1cd contained in a cadmium box 2 are housed in a housing box 3 which is set at points of different distance in the facility and its vicinity, and is maintained and managed. If the neutron radiation is leaked, the gold foils 1 and 1cd are taken out for measuring a neutron fluence, and a measuring result is presented to customers. Since, the neutron radiation attenuates according to distance, the weight of gold foil is changed according to the distance from a neutron radiation generating source. Thus, the neutron dosage is quickly measured with precision in an emergency, and the measuring result is reported to official body through the customers, for appropriate action.