Light detection unit and alpha ray observation device

摘要

A light detecting unit of an alpha ray observation device observes an alpha ray by measuring generated light that is generated by the alpha ray produced in a region of a to-be-measured object. The light detecting unit has a travel direction changing unit that changes the direction of travel of generated light, a light detector that detects direction-changed light, which is the generated light after the direction of travel is changed, and a shielding member that shields the light detector from radiation and has a portion that is provided on the line from the to-be-measured object to the light detector. The shielding member may also surround the perimeter of the light detector and have an opening to allow generated light to reach the travel direction changing unit.

主权项

1. A light detecting unit to observe alpha rays by measuring a generated light generated by alpha rays occurring in a region of a to-be-measured object, comprising:
a travel direction changing unit configured to change a travelling direction of the generated light; a light detector configured to detect direction-changed light of the generated light changed in traveling direction; and a shielding member including a portion provided on a straight line extending from the to-be-measured object to the light detector to shield the light detector against radiation.