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闪烁晶体荧光光谱测试

闪烁晶体荧光光谱测试
 

什么是闪烁晶体?

SHANSHUOJINGTIDAODISHISHENME?KENENGHENDUORENDOUMEITINGGUOZHEIGECI,DANQISHI,ZAIWOMENDERICHANGSHENGHUOZHONGBINGBUMOSHENG。SHANSHUOTISHIYIZHONGDANGBEIDIANLIFUSHEJIFAZHIHOUHUIBIAOXIANCHUFAGUANGTEXINGDECAILIAO,SHIJIANGGAONENGZHUANHUANWEIKEJIANGUANGDEYIZHONGDIANXINGGUANGDIANZHUANHUANCAILIAO,KEYONGYUFUSHETANCEHEANQUANFANGHU,TONGCHANGZAIYINGYONGZHONGJIANGQIJIAGONGCHENGJINGTI,CHENGWEISHANSHUOJINGTI。

 

在医学上,闪烁体是核医学影像设备比如X光、CT等检查设备的核心部件。同时,在行李安检、集装箱检查、大型工业设备无损探伤、石油测井、放射性探测、环境监测等领域,闪烁体都发挥着不可替代的作用。
 

GEZHONGSHANSHUOJINGTI

 

典型材料

目前市面上比较成熟且商业化的闪烁体有碘化铯(CsI:tl),碘化钠(NaI:tl),硅酸钇镥(LYSO:Ce),锗酸铋(BGO)和钨酸镉(CdWO4)等。
 

彩吧助手TONGSHIKEXUEJIEYEBUFADUIXINXINGSHANSHUOTICAILIAODEYANJIU,2018NIAN,XIBEIGONGYEDAXUEDEHUANGWEIYUANSHI、XINJIAPOGUOLIDAXUELIUXIAOGANGJIAOSHOU、CHENQIUSHUIBOSHIYIJIFUZHOUDAXUEYANGHUANGHAOJIAOSHOUDENGHEZUO,FAXIANLEYIZHONGHANYOUSEHEQIANZHONGYUANZICHENGFENDEQUANWUJIGAITAIKUANGNAMIJINGSHANSHUOTI,QIJUYOUJIAOQIANGDEXSHEXIANXISHOUNENGLI、GAOXIAODESANZHONGTAIFAGUANGTEZHENG、KEDIAOKONGDEDIANZINENGJIJIEGOUYIJIJIAOKUAIDEFUSHEFAGUANGSULV。XIANGGUANYANJIUGONGZUOYI“All-inorganic Perovskite Nanocrystal Scintillators”WEITIYUNatureZAZHIZAIXIANFABIAO。

在X射线照射下全无机钙钛矿纳米晶闪烁体的可调谐发光(数据截取自文章“All-inorganic Perovskite Nanocrystal Scintillators”)
 

典型闪烁晶体的参数特性

 

Properties/crystal

CsI (Tl)

NaI (Tl)

CsI(Na)

BGO

GSO

PWO

NPWO

CWO

ZnSe(Te)

Crystal structure

cubic

cubic

cubic

cubic

-

Tetragonal

Tetragonal

Tetragonal

-

Lattice constant( Å )

4.566

6.46

-

-

-

彩吧助手a = 5.416, c = 12.049

a=5,281, c=11,510

-

-

Melting point, °C

894

924

894

1050

1950

1123

920

1325

彩吧助手1773 - 1793

Density, g/cm3

4.51

3.67

4.51

7.13

6.71

8.28

7.57

7.9

5.42

Mohn hardness

2

2

2

5

6

3.5- 4.0(C)

4.9

4 - 4.5

-

Thermal expansion, 10-6/K

50

47.4

49

-

-

10

-

10.2

-

Refractive index

1.79

1.85

1.84

1.05-1.12

1.38

2.16

2.31

2.2 - 2.3

2.58 - 2.61 at 610 nm

Emission wavelength (nm )

560

410

420

300

440

450 / 420

520, Cherenkov eff.

470/540

610(fast), 640(slow)

Decay constant (ns )

1000

230

630

5

6

6

6

彩吧助手20 ns @ 470nm

彩吧助手1-3(fast), 30-70(slow)

5 ms @ 540 nm

Radiation length (cm )

1.86

2.9

-

-

-

0.92

-

0.3

-

Hygroscopic

yes

yes

yes

No

No

No

No

No

No

Afterglow % at 6ms

0.05 - 5.0

0.5 - 5.0

0.5 - 5.0

-

-

-

-

0.1

< 0.05

Effective atomic number

54

50

54

75

59

73

74

65

33

Light yield [photons/MeVy]

52- 56 x103

38 x 103

(35 - 42) x 103

-

-

22.6~ 25.6x 104

5% of BGO

1.2 - 1.5 x 104

8.0 x 104

Background, pulse/sec/kg

< 3.0

< 3.0

< 3.0

-

-

-

-

-

-

Crystal cleavage plane

none

-100

none

-

-

-101

-

-10

-

 

闪烁晶体的荧光光谱测试

既然说闪烁晶体是典型的光电转换材料,那么测试闪烁晶体的发射光谱就必不可少了。此类材料主要用X射线做激发,用可见波段响应的探测器进行探测采集。
 

卓立汉光可提供一成套的闪烁体荧光光谱测试解决方案(系统包含:X射线光管,样品仓,光谱仪,光电倍增管(PMT),单光子计数器,提供铅盒、含铅玻璃等系统防护)。
 

客户案例
 


系统由氙灯、激发光谱仪、样品仓、发射光谱仪、探测器、数据采集器组成传统荧光光谱测量系统,另耦合小型X光管用于闪烁晶体激发。
 
 

XUANYONGMEIGUOMOXTEKGONGSI 60KV 12WXIAOXINGXGUANGGUANDUISHANSHUOJINGTIJINXINGJIFA,GUANGYUANXIAOQIAOQIEDAISANRE,TONGGUORUANJIANKONGZHISHUCHUGONGLV;

CsISHANSHUOJINGTISHICESHUJU


YLF: 5%Ce3+闪烁晶体实测数据

 

美国MOXTEK(先锋科技独家代理)小型X光管
 

ZUOWEISHIJIE*ZHIMINGDEXIAOXINGXGUANGGUANZHIZAOSHANG,MoxtekSHIZHONGZOUZAISHOUCHISHIXIAOXINGXGUANGGUANJISHUQIANLIE,SHIJIEJIDAZHIMINGXRFCHANGSHANGDOUJIANGMoxtekLIEWEIDIYIGONGYINGSHANG。WOMENKEYITIGONGBUTONGBACAIJIWAIXINGCHICUN。

 
 

Moxtek®MAGPRO系列 60KV & 70KV X射线光源,该系列X光管使用简单,一端接上电源线供电,另一端连接电脑USB,即可通过软件输入电流值、电压值控制X光管的输出;
 

60KV & 70KV X射线光源 参数特性
 

Specifications

 

60kV

70kV

XRF

Imaging

XRF

Tube type:

彩吧助手Metal-ceramic

Operating Temp*:

-10º to +50º C

-10º to +50º C

-10º to +50º C

Storage Temp:

彩吧助手-20º to +85º C

Standard Cooling:

Forced air

Weight:

≤825g

≤900g

≤900g

Available Targets:

W, Rh, Ag, Cr, Cu, Mo

W

W, Mo

HV Polarity:

Grounded anode

High Voltage Potential:

5 to 60kV

50 to 70kV

40 to 70kV

Max Beam Current:

10 to 1000µA @ 5kV

10 to 240µA @ 50kV

彩吧助手10 to 300µA @ 40kV

Maximum Power:

12 watts

Focal Spot Size:

彩吧助手Typical ~400µm

Typical ~500µm

Typical ~500µm

Window:

Beryllium 125µm or 250µm (depending on target)

X-ray Beam Cone Angle:

~48°

~86°

~48°

Radiation Leakage:

彩吧助手as low as 2mR/h**

2mR/h at 50mm

彩吧助手<10mR/h at 50mm

Input Power:

彩吧助手24 VDC, 1.1A

Standard Warranty:

One yea


目前卓立汉光的闪烁晶体荧光光谱测试系统的典型客户代表有:中山大学、深圳大学、中国科学院海西研究院等