The present invention relates to beta radiation line investigation apparatus, avengers (eastern position element) of respectively different radioactive ray and the energy is mounted on a swivel plate in more detail, this is correction and the tentative radiation detecting apparatus of the correction or tentative radioactive ray instrument in order to proofread radioactive ray instrument. For this purpose, internally can rotatably rotate, and on most position in the salty body of front exploitation, the swivel plate of a boatswain is formed from most seat The convolution power of upper rotation version axis rotation It is whirled up power .. it is arranged to mounted, and by salty body internal shield, and the lead that the investigation bureau provided on the upper end website of swivel plate includes: including beta radiation line investigation apparatus.
