Dosimeter container and dosage measuring body

Patent metadata

Field	Value
Publication number	US-10877165-B2
Application number	US-201815777164-A
Country	US
Kind code	B2
Filing date	Mar 27, 2018
Priority date	Mar 31, 2017
Publication date	Dec 29, 2020
Grant date	Dec 29, 2020

Abstract

A dosimeter container comprising a housing portion and a shield portion that surrounds the housing portion is provided. The housing portion houses a radiation dosage measuring device for measuring a dosage of predetermined radiation other than neutron radiation. The shield portion is composed of a member made of a material that transmits predetermined radiation and shields neutron radiation. The shield portion is a LiF sintered body, in particular, a 6LiF sintered body. Further, the shield portion includes at least two or more shield portion components (a body portion and a lid portion), in which adjacent members can abutt against each other. The housing portion is same size as or larger than the size of the radiation dosage measuring device; and the housing portion extends over the entirety of the components. The dosimeter container is preferably used as a dosage measuring body having a radiation dosage measuring device stored in the housing portion.

First claim

What is claimed is:

1. A dosimeter container comprising: a housing portion for housing a radiation dosage measuring device for measuring a dosage of predetermined radiation other than neutron radiation; and
a shield portion surrounding the housing portion and including at least a LiF sintered body, the LiF sintered body transmitting the predetermined radiation to be measured with the radiation dosage measuring device but blocking neutron radiation,
wherein the LiF sintered body is a 6 LiF sintered body including 6 LiF and has a relative density of 83% or more to 90% or less which is obtained by dividing the density of the sintered body by a theoretical density equal to 2.64 g/cm 3 of LiF and multiplying the resulting value by 100.

2. The dosimeter container according to claim 1 , wherein the predetermined radiation is gamma radiation.

3. The dosimeter container according to claim 1 , wherein the shield portion includes at least two or more shield portion components, and adjacent shield portion components of the at least two or more shield portion components that have mutually abuttable structures.

4. The dosimeter container according to claim 3 , wherein the adjacent shield portion components have mutually fittable structures.

5. The dosimeter container according to claim 4 , wherein the housing portion has a size the same as or larger than the size of the radiation dosage measuring device, and
the housing portion extends over the entirety of the shield portion components.

6. The dosimeter container according to claim 5 , wherein a shortest distance from an inner surface of the housing portion to outer surfaces of the shield portion components is constant.

7. A dosage measuring body, comprising the radiation dosage measuring device housed in the housing portion of the dosimeter container according to claim 1 .

Assignees

• Nippon Light Metal Co

Inventors

• Usui Hideaki
• Furuya Hidaka
• Takahashi Maki
• Ishikawa Hidenori

Classifications

• G21F5/00

  Transportable or portable shielded containers · CPC title

• G21F3/00

  Shielding characterised by its physical form, e.g. granules, or shape of the material · CPC title

• G01T7/00 Primary

  Details of radiation-measuring instruments · CPC title

• G01T1/00

  Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation (G01T3/00, G01T5/00 take precedence) · CPC title

• A61N5/00

  Radiation therapy (ultrasound therapy A61N7/00; devices or apparatus applicable to both therapy and diagnosis A61B6/00) · CPC title