Helium chamber for x ray exposure device

Abstract

Abstract PURPOSE:To enable a high helium concentration to be retained by providing an oxygen monitor for measuring oxygen concentration within an airtight chamber, and a tank for keeping helium gas which is discharged from an airtight chamber. CONSTITUTION:An oxygen monitor 9 for measuring oxygen concentration within a sealed chamber 5 and a tank 11 with an introduction port which is airtightly connected to the discharge port of an airtight chamber 5 and a discharge port which releases internal gas into air are provided. Then, the oxygen monitor 9 is used to measure oxygen concentration within the airtight room 5 and exposure is performed after confirming that oxygen concentration is fully low. Helium gas discharged from the airtight chamber 5 stays within a tank 11 and helium gas flows into the airtight chamber 5 from the tank 11 even if the airtight chamber 5 is in negative pressure status. It prevents air from flowing into the airtight chamber 5 in reverse direction even if the pressure within the airtight chamber 5 drops due to gas suction by the a pump of the oxygen monitor 9.

Inventors

• 👤 Ryoji Tanaka
• 👤 良治 田中
• 👤 Hidekazu Kono
• 👤 英一 河野
• 👤 Joji Iwata
• 👤 岩田　穣治

Bibliographic Details