| 摘要 |
PROBLEM TO BE SOLVED: To provide a radiation detecting device having high measurement accuracy for radiation.SOLUTION: In a radiation measuring device A, an annular clearance S is formed between an inner circumferential face of an insertion port 1d of a shield body 1 and an outer circumferential face of a small diameter portion Cb of a radiation detector C. An upper end portion of the shield body 1 is provided with a pair of lid bodies 3, 3 rotatable for opening and closing. When the pair of lid bodies 3, 3 are rotated into a close position, the annular clearance S is closed. This makes it possible to prevent radiation from penetrating into the shield body 1 from the clearance S. |
