We had used highly sensitive instruments to measure the radioactivity in irradiated apples by cobalt-60. The irradiation dose was thirty thousand rads. These apples were from three different places. Their gamma-ray spectra were measured with an HPGe compton suppression spectrometer. The main radioisotope in the apples is

40

K

total α

total

β

and

40

K radioactive intensities were given for the irradiated and non-irradiated apple samples.

The experiment results pointed out that the radiations in irradiated and non-irradiated apples were the same. The work gives the radioactivity background in the apples.