Extremely low background technology of its own excellence
The world’s highest level of detection performance in the measurement of the H-3 is realised with unique unparalleled detector structure and excellence technology for reducing background.
Passive shield by thick lead and active shield by high-performance guard counter would reduce effectively the effects of exogenous radiation and achieve measurement with a very low level radioactivity.
In 1971, world’s first background reducing technology by guard counter was introduced. Evolving from the traditional models, it has been reborn as the AccuFLEX series, represents outstanding presence and excellent performance.
The world’s highest level of detection performance in the measurement of 3H
The world’s highest level of tritium detection has been achieved.
It has been realized by the unique detector structure with the vial up to 145 ml, three photomultiplier tubes, and reducing the effects of external radiation by the guard counter, anti-coincidence signal detection and massive layer of lead.
Direct measurement is ensured without pre-processing. such as electrolytic enrichment, for ultra-low level ‘H measurement in the environmental samples.
Accu.FLEX Lsc LSC-LB7 realized the value of more than 285,000 FM-value.
Detection limit is not exceeding approximately 0.61Bq/L in the 500 minutes measurement, and 1,440 minutes (24-hour) measurement provides less than the 0.36 Bq/L.
(Efficiency: 25, Sample volume: 40mL,Background: 3.5c:pm)
High-resolution measurement in the 3H and 14 C regions
Liquid scintillation system often uses 3H and 14 C regions. LSC-LB7 can measure with high energy resolution of 0.005kcV/c.b. in 11 region, and region can be measured with high resolution of 0.05kcV/c.b..4,000ch multi–channel analyzer and automatic gain controller realize high resolution.
Level method (ESCR or SCCR method)
Compton spectrum of an external radiation source
- ESCR (External Standard Channel Ratio)
The internal radiation source” equipped with the system radiates gamma rays to the samples. The Compton spectrwn obtained by this system is analyzed by the multi-channel analyzer and the channel equivalent to 75% of the total counts is called as a quenching indicating parameter. This enables a very wide range of quenching corrections, making it ideal for low-radiation samples.
*Equipped with WBa-740kBq: !CJS than the exception levels in Basic Safety Standards by IAEA
- SCCR method (Self Constant Channel Ratio)
This is a method to make the shape of the spectrum of the sample itself as a quenching indicating parameter without the use of the external radiation source. Similar to the ESCR method, the result is analyzed by the multichannel analyzer, making the channel equivalent to 75% a quenching indicating parameter. This is ideal for measuring extremely small amount of samples (in the order of !OJAI to100t.t1).
Efficiency Tracing Method (ETM) /Intelligent LSC function (option)
Liquid scintillation system often uses 3H and 14C regions. LSC-LB7 can measure with high energy resolution of0.005kcV/c.b. in 1-1 region, and region can be measured with high resolution of 0.05kcV/c.b..4,000ch multi–channel analyzer and automatic gain controller realize high resolution.
- Efficiency Tracing Method (ETM)
This is a measurement method that maximizes the use of the multi-channel analyzer and data calculation function. The spectrum of the measured samples is captured in multifactor way to automatically determine the regression equation and calculate the dpm and Bq values of the sample based on the efficiency tracing curve. This method does not require quenching correction and eliminates the gamma time using the internal radiation source., resulting in a rapid measurement of samples.
- Intelligent LSC Function (Optional)
Hitachi Aloka’s unique intelligent LSC function (Auto Isotope Select) automatically determines nuclides for each sample and automatically selectS the correction methods and measurement windows. By just setting the measurement time and cycles, accurate dpm and Bq values can be obtained. The nuclides which the system determined are also displayed/printed in the measurement result.