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We have investigated the possibility of calibrating the PMTs of scintillationdetectors, using the primary scintillation produced by X-rays to induce singlephotoelectron response of the PMT. The high-energy tail of this response, canbe approximated to an exponential function, under some conditions. In thesecases, it is possible to determine the average gain for each PMT biasingvoltage from the inverse of the exponent of the exponential fit to the tail,which can be done even if the background and/or noise cover-up most of thedistribution. We have compared our results with those obtained by the commonlyused single electron response (SER) method, which uses a LED to induce a singlephotoelectron response of the PMT and determines the peak position of suchresponse, relative to the pedestal peak (the electronic noise peak, whichcorresponds to 0 photoelectrons). The results of the exponential fit methodagree with those obtained by the SER method when the average number ofphotoelectrons reaching the first dynode per light/scintillation pulse isaround 1.0. The SER method has higher precision, while the exponential fitmethod has the advantage of being useful in situations where the PMT is alreadyin situ, being difficult or even impossible to apply the SER method, e.g. insealed scintillator/PMT devices.

In-situ calibration of a PMT inside a scintillation detector by means of primary scintillation detection