How does Optically Stimulated Luminescence work?
Optically stimulated luminescence (OSL) is a process in which a pre-irradiated (exposed to ionizing radiation) material when subjected to an appropriate optical stimulation, emits a light signal proportional to the absorbed dose. The wavelength of the emitted light is the characteristic of the OSL material.
What is an OSL dosimeter?
Optically stimulated luminescence (OSL) is a methodology that can be employed in personnel dosimetry to determine the “dose of record.” It is an alternative to thermoluminescent dosimetry. 3. • It is an alternative to thermoluminescent dosimetry and film dosimetry.
How accurate is optically stimulated luminescence?
The OSL dosimeter provides a new degree of sensitivity by giving an accurate reading as low as 1 mrem for x-ray and gamma ray photons with energies ranging from 5 keV to greater than 40 MeV. The OSL dosimeter’s maximum equivalent dose measurement for x-ray and gamma ray photons is 1000 rem.
When was optically stimulated luminescence invented?
1956
Optically Stimulated Luminescence (OSL) The use of OSL for radiation dosimetry was first proposed in 1956 (Akselrod et al., 1998). The mechanism of OSL involves illumination of an irradiated crystal with a specific wavelength of light to initiate the movement of charge trap sites to luminescent centers.
What is the difference between film badge and OSL?
The essential difference between a TLD dosimeter and an OSL dosimeter regarding the way that each dosimeter works is that a TLD dosimeter requires heat in order to function, whereas an OSL dosimeter only requires optical stimulation.
What do optically stimulated luminescence dosimeters thermoluminescent dosimeters pocket ionization chambers and digital ionization dosimeters have in common?
tiny electric currents with high precision and accuracy. What do optically stimulated luminescence dosimeters, thermoluminescent dosimeters, pocket ionization chambers, and digital ionization dosimeters have in common? These devices all use the same sensing material to detect ionizing radiation.
What dosimeter uses aluminum oxide?
An OSL dosimeter uses aluminum oxide (AI203) in order to absorb X-ray energy, release it, and measure the precise dose of ionizing radiation that is received. OSL dosimeters are arguably more helpful for pregnant women and other employees operating in lower-radiation environments.
What is an optically stimulated luminescence dosimeter?
The OSL dosimetry (Optically Stimulated Luminescence) is a method that has established itself in the whole-body dosimetry. The OSL dosimeter provides a very high degree of sensitivity by giving an accurate reading as low as 1 mrem for x-ray and gamma ray photons with energies ranging from 5 keV to greater than 40 MeV.
What is optically stimulated luminescence in Archaeology?
Optically-Stimulated Luminescence is a late Quaternary dating technique used to date the last time quartz sediment was exposed to light. Once this sediment is deposited and subsequently buried, it is removed from light and is exposed to low levels of natural radiation in the surrounding sediment.
What is optically stimulated luminescence?
• Optically stimulated luminescence (OSL) is a methodology that can be employed in personnel dosimetry to determine the “dose of record.” It is an alternative to thermoluminescent dosimetry
What is OSL dosimetry?
It is an alternative to thermoluminescent dosimetry 3 • It is an alternative to and film dosimetry. • Materials suitable for OSL are similar to those used in thermoluminescent dosimetry, i.e., they are crystalline solids.
What is Landauer OSL dosimeters stimulating light?
Landauer OSL Dosimeters Stimulating Light • Landauer’s stimulation source is a pulsed argon laser beam with a frequency (pulse rate) of 4000 Hz. Each light pulse lasts 250 ns. 29 • The argon laser emits a green light at 514 nm.
What is the difference between OSL and thermoluminescence?
• Optically stimulated luminescence (OSL) and thermoluminescence (TL) are very similar – the only difference is the manner in which the electrons are freed from their traps 4 electrons are freed from their traps. • OSL dosimeters are of more recent vintage than thermoluminescent dosimeters (TLDs). General Basic Mechanism