Alpha emitter detection systems using a UV light detector

Naoto Kume; Naoto Kume; Akio Sumita; Akio Sumita; Naoya Sakamoto; Naoya Sakamoto; Takeshi Hoshi; Takeshi Hoshi; Koki Okazaki; Koki Okazaki; Haruo Miyadera; Haruo Miyadera; Yasufumi Miyahara; Yasufumi Miyahara; Yuki Nakai; Yuki Nakai

doi:10.1364/AO.446006

Applied Optics
Vol. 61,
Issue 6,
pp. 1414-1419
(2022)
•https://doi.org/10.1364/AO.446006

Alpha emitter detection systems using a UV light detector

Naoto Kume, Akio Sumita, Naoya Sakamoto, Takeshi Hoshi, Koki Okazaki, Haruo Miyadera, Yasufumi Miyahara, and Yuki Nakai

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Naoto Kume, Akio Sumita, Naoya Sakamoto, Takeshi Hoshi, Koki Okazaki, Haruo Miyadera, Yasufumi Miyahara, and Yuki Nakai, "Alpha emitter detection systems using a UV light detector," Appl. Opt. 61, 1414-1419 (2022)

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Table of Contents Category
- Imaging Systems, Image Processing, and Displays
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About this Article
History
- Original Manuscript: October 21, 2021
- Revised Manuscript: January 23, 2022
- Manuscript Accepted: January 23, 2022
- Published: February 15, 2022

Abstract

To visualize alpha contamination, an alpha-particle detection system has been developed that is capable of detecting alpha-induced UV lights from a few meters distance in dark environments. It detects UV lights from ionized nitrogen with a photomultiplier tube. To identify the contaminated spot quickly, large diameter lenses were designed and tested.

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Items	Value
View angle	30.0 deg
System weight	380 kg
System size	Lowest position, $1100 (W) [m m] \times 1464 (L) [m m] \times 1065 (H) [m m]$ ; Highest position, $1100 (W) [m m] \times 1464 (L) [m m] \times 2235 (H) [m m]$
Range of movement	Height, 865 to 2035 mm Pan, ${\pm 180}^{\circ}$ Tilt, $- 45 d e g$ to 120 deg
Power	AC100V-5 A

Items	Value
Lens components	First, second lens, plano–convex lens. $Φ 100 m m$ ; Third lens, Aspherical lens. $Φ 86 m m$ ; Fourth lens, Plano–convex lens. $Φ 60 m m$
Focal length [mm]	41.46
Angle of view [deg]	$\pm 15$

#	Activity	Size	Distance from Alpha Camera
1	2.96 kBq	plate, $100 m m \times 100 m m$	1.4 m
2	9.4 kBq	plate, $Φ 36 m m$	2.6 m
3	744 Bq	plate, $100 m m \times 100 m m$	1.7 m
4	220 Bq	plate, $100 m m \times 100 m m$	1.7 m

Items	Value
View angle	30.0 deg
System weight	380 kg
System size	Lowest position, $1100 (W) [m m] \times 1464 (L) [m m] \times 1065 (H) [m m]$ ; Highest position, $1100 (W) [m m] \times 1464 (L) [m m] \times 2235 (H) [m m]$
Range of movement	Height, 865 to 2035 mm Pan, ${\pm 180}^{\circ}$ Tilt, $- 45 d e g$ to 120 deg
Power	AC100V-5 A

Items	Value
Lens components	First, second lens, plano–convex lens. $Φ 100 m m$ ; Third lens, Aspherical lens. $Φ 86 m m$ ; Fourth lens, Plano–convex lens. $Φ 60 m m$
Focal length [mm]	41.46
Angle of view [deg]	$\pm 15$

Abstract

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Applied Optics