---
format: markdown
title: YAP scintillation probe - CRYTUR
...

#**Basic description**

* scintillation probe, which is routinely used for monitoring of HXR radiation at Golem tokamak


**Physical properties of scintillation material:**

| Density                  | Hardness by Mohs | Index of refraction | Melting point    | Thermal expasion            | Crystal structure | Hydroscopic |
|--------------------------|------------------|---------------------|------------------|-----------------------------|-------------------|-------------|
| $5,37 \ \mathrm{g/cm^3}$ | 8,6              | 1,95                | $1875^{\circ} C$ | $0.4-1.1 \times 10^{-5}/K $ | rhombic           | No          |


**Scintillation properties of scintillation material:**


| Wavelength of max. emission | Decay constant     | Afterglow                      | Radiation length for $511 \ \mathrm{511}$ | Photo yield at $300 \ \mathrm{K}$ ($27 ^{\circ}C$) | Integrated light output compared to NaI:Tl |
|-----------------------------|--------------------|--------------------------------|-------------------------------------------|----------------------------------------------------|--------------------------------------------|
| $370 \ \mathrm{nm}$          | $25 \ \mathrm{ns}$ | $0.0005 \%$ at $6 \mathrm{ms}$ | $2.7 \ \mathrm{cm}$                       | $25\times10^3 \ \mathrm{Ph/MeV}$                   | $70 \%$ NaI:Tl                             |

For additional information about YAP(Ce) scintillation material see [page](https://www.advatech-uk.co.uk/yap_ce.html) or [page](https://www.crytur.cz/materials/yap-ce/)


![YAP scintillation probe with photomultiplier](/Diagnostics/Radiation/HXR/Probes/YAP_Crytur/yap_detector.jpg)

#**Useful hints**

* scintillation probe should be operated with relatively low voltage $< 1 \ \mathrm{kV}$, optimal operation voltage $\approx 0.6 \ \mathrm{kV}$

#**Useful materials and manuals**

[Photomultiplier datasheet - Hamamatsu R6095](/Diagnostics/Radiation/HXR/Probes/YAP_Crytur/Photomultiplier_R6095.pdf)