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Outdoor Uranium Thorium Scintillation Crystal Mining Detector
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Meorient Import & Export Co.LTD
China - Hangzhou
Trading Company
Trade Capacity
Export Percentage
Nearest Port
Hangzhou,Shanghai
Accepted Delivery Terms
Employees
5-10人
Accepted Payment Currency
USD,CNY
Average Lead Time
45 Day(s)
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Product Specifications
--Product Description
Product Parameters
Product Description：
Bismuth Germanate (BGO) is a high Z, high density scintillation material with chemical composition Bi4Ge3O12. Due to the high atomic number of bismuth (83) and its high density, BGO is a very efficient γ-ray absorber.
BGO is a relatively hard, rugged, non-hygroscopic crystal which does not cleave. The material does not show any significant self-absorption of the scintillation light. BGO can be machined to various shapes and geometries. The crystal housing can be simple since no hermetic sealing is required.
Density [g/cm3] | 7.13 |
Melting point [K] | 1323 |
Thermal expansioncoefficient [C-1] | 7 x 10-6 |
Cleavage plane | none |
Hardness (Mho) | 5 |
Hygroscopic | no |
Wavelength of emission max [nm] | 480 |
Lower wavelength cutoff [nm] | 320 |
Refractive index @ emission max. | 2.15 |
Primary decay time [ns] | 300 |
Light yield[photons/keVγ] | 8 - 10 |
Photoelectron yield [% of NaI(Tl)] (for γ-rays) | 15 - 20 |
Temperature response | -1.2%/C |
Neutron capture cross-section | 1.47b |
Afterglow @ 20ms | 150ppm |
Features：
The scintillation emission maximum of BGO is situated at 480nm. Figure 1 shows the emission spectrum. The light emission in photons/keV is about 15-20% of NaI(Tl); but, since the emission is partly in the area above 500nm where phototubes are less sensitive, the relative photoelectron yield of a bialkali PMT compared to NaI(Tl) amounts to 10-15%.
Figure 2 shows a pulse height spectrum obtained by irradiating a BGO crystal with 662 keV γ-rays.
Due to the high Z value of the material, the photofraction for γ-ray absorption is high; and BGO scintillation crystals are used in applications where a high photofraction is required (for example, PET scanners) or because of its high detection efficiency (for example, Compton suppression spectrometers). It is a combination of properties that make BGO the material of choice for neutron activation analysis. Figure 4 shows the photopeak efficiency (also called the photofraction) – the ratio of the number of counts in the total absorption photopeak to the total number of counts as a function of the γ-ray energy for 38mm diameter, 38mm high (1.5" x 1.5") NaI(Tl) and BGO crystals.
The decay time of BGO is about 300ns at room temperature, which is comparable to that of NaI(Tl). As there is no slow component in BGO and the rise time is quite fast (intrinsic scintillator), it is possible to get good timing <2ns with 3” thick crystals .
The scintillation intensity of BGO is a strong function of the temperature. Figure 3 shows the relation. At room temperature, the rate of change with temperature is approximately -1.2%/C.
The radioactivity in BGO can make BGO unacceptable for some applications. We have developed a production process that significantly reduces the natural background, making our BGO well-suited for most applications.
BGO scintillation crystals are susceptible to radiation damage starting at radiation doses between 1 and 10 Gray (102 - 103 rad). The effect is largely reversible with time or annealing. Since the radiation damage to BGO crystals depends on the presence of sub ppm impurities, large differences between individual crystals can occur.
It is possible to read out BGO crystals with silicon photodiodes but, due to the moderate light output, this is only useful for the detection of high energy particles, or photons of more than a few MeV.
-Experiment Show
The BGO crystal with SiPM has been wrapped in PTFE tape (teflon) in order to increase the light yield. The teflon tape is white so it reflects back the light that would otherwise come out. The crystal is then covered with black heat shrink sleeve in order to shield the SiPM from ambient light, and the front face is protected with aluminum foil.
BGO solution :Coupling with BGO (size: 5” *3.15”* 1” ):
1、 Coupling one side : FHM=17.15% （@661keV）
2、Coupling both side : FHM=15.25% （@661keV）
Product Description
Packing & Delivery
Company Profile
GOHI Technology (Wuhan) Co., Ltd. is an emerging photoelectric instrument manufacturing enterprise integrating sales, R&D, production, operation and service. It is mainly engaged in the sales and independent R&D and production of Nuclear Detection and Radiation protection related products. Our company is based on independent innovation, pays attention to user needs. We also have a team with strong R&D technical force, strong technical support, and precise service, focusing on software and hardware development, system integration, research and application development of photoelectric instrumentation.
Our company adheres to the tenet of people-oriented, honesty and innovation, advancing with the times, and dedicated service. In the fierce competitive environment, our company insists on continuous technological innovation to create value for customers, relying on continuously enhanced R&D capabilities and outstanding flexible customization service capabilities. Perfect delivery capabilities win the trust and cooperation of customers.
FAQ
Q1.Do you have MOQ?
Depends on different ideas, Can be negotiated.The larger the quantity is, the competitive the unit price will be.
Q2.Should the customer pay the delivery fee,How much is it?
For the delivery fee,many samples are be requested to be sent,so we must get delivery fee.
If you tell me to use the appointed Express,you will give me your express account or you will pay according to the Express.
If you do not request,I will choose a cheap one in China.
Q3.How about the after sale service?
1)We will always keep the quality the same as the buyer's samples and if there is something with the quality,we will make compensation for our customers.
2)We will suggest our packing and take charge in our packing,we will keep the goods safe in the delivery.
3)We will trace the goods from the production to selling,we will solve the problems in the selling for our customers.
Q4.When can I get a price？
We usually quote within 24 hours after we get your inquiry.
Q5: Are you a trade company or manufacturer?
We are a professional manufacturer with our own factory.
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