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An investigation of the {\alpha}-decay of $^{147}$Sm was performed using anultra low-background Twin Frisch-Grid Ionisation Chamber (TF-GIC). Four naturalsamarium samples were produced using pulsed laser deposition in ultra highvacuum. The abundance of the $^{147}$Sm isotope was mea- sured usinginductively coupled plasma mass spectrometry. A combined half-life value for147Sm of $1.079(26)\times{}10^{11}$ years was measured. A search for the{\alpha}-decay into the first excited state of $^{143}$Nd has been performedusing $\gamma$-spectroscopy, resulting in a lower half-life limit of $T_{1/2} >3.1 \times{}10^{18}$ years (at 90% C.L.).

High precision half-life measurement of $^{147}$Sm $\alpha$ decay from thin-film sources