The present discloses a radioactivity activity transfer and measuring device and belongs to the radioactivity
activity measurement field. The device comprises a shielding chamber, a
detector, a supporting table and a reference source; the
detector is disposed in the shielding chamber; the
detector is a
scintillation detector composed of a well type NaI (Tl)
crystal; the supporting table is used for supporting the shielding chamber; and the reference source is arranged within the detector. A radioactivity activity measuring method includes the following steps of: a, the radioactivity activity measuring device is turned on and warmed up, and the resolution of the detector is checked; b, energy calibration is performed on the detector; c, a background
energy spectrum is measured; d, the
energy spectrum of a sample to be tested is measured; e, the full spectrum count rate of the sample is read, so that the net count rate n of the sample is obtained; f, the net count rate n of the sample tobe tested and
total efficiency are substituted into a formula A=n / epsilonT; and g, the activity A of the sample to be tested is calculated. The portable radioactivity activity transfer and measuringdevice and measuring method of the invention have the advantages of small size and light weight.