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A simple routine is proposed for monitoring the efficiency value of a lowpressure pentane filled multi-wire proportional chamber (MWPC) in long termexperiments. The proposed algorithm utilizes a two parameter approximation forthe background function. It is based on a linear approximation of thebackground in the energy range of 4.8 to 10.0 MeV and an exponentialapproximation of the neutron induced tail in the 1.5 to 4.2 MeV region. Thisspecific energy interval is used to measure the efficiency value. Prior todiscussing the algorithm, a description of the DGFRS-2 setup detection moduleis provided. Additionally, an example of its application is presented for thecomplete fusion of a heavy ion induced 232Th+48Ca = Ds complete fusion nuclearreaction. Descriptions of two other two-parameter functional dependencies forbackground approximations are also provided. A feature of this algorithm isthat there is no interruption of the main experiment for a calibration test(reaction). An alternative scenario is considered in brief too. In consist of ameasurement of scattered target like ions in 30 to 45 MeV energy interval toestimate an efficiency value.

An express monitoring procedure for low pressure MWPC efficiency value in heavy ion induced complete fusion nuclear reactions