Passive neutron area monitor with pairs of TLDs as neutron detector

• A passive neutron area monitor was built and evaluated.
• The monitor uses pairs of TLD 600 and TLD700.
• It was evaluated in the beam port of a TRIGA Mark III reactor.
• The performance was also evaluated in a 15 MV LINAC.

A passive neutron area monitor has been designed using Monte Carlo methods; the monitor is a polyethylene cylinder with pairs of thermoluminescent dosimeters (TLD600 and TLD700) as thermal neutron detector. The monitor was calibrated with a bare and a thermalzed 241AmBe neutron sources and its performance was evaluated measuring the ambient dose equivalent due to photoneutrons produced by a 15 MV linear accelerator for radiotherapy and the neutrons in the output of a TRIGA Mark III radial beam port.