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We give the results of a study on the 222Rn decay we performed in the GranSasso Laboratory (LNGS) by detecting the gamma rays from the radon progeny. Themotivation was to monitor the stability of radioactivity measuring severaltimes per year the half-life of a short lifetime (days) source instead ofmeasuring over a long period the activity of a long lifetime (tens or hundredsof years) source. In particular, we give a possible reason of the largeperiodical fluctuations in the count rate of the gamma rays due to radon insidea closed canister which has been described in literature and which has beenattributed to a possible influence of a component in the solar irradiationaffecting the nuclear decay rates. We then provide the result of four half-lifemeasurements we performed underground at LNGS in the period from May 2014 toJanuary 2015 with radon diffused into olive oil. Briefly, we did not measureany change of the 222Rn half-life with a 8*10^-5 precision. Finally, we providethe most precise value for the 222Rn half-life: 3.82146(16){stat}(4){syst}days.

Precise measurement of the 222Rn half-life: a probe to monitor the stability of radioactivity