DE156801T1

DE156801T1 - METHOD AND DEVICE FOR MEASURING RADIOACTIVE DECOMPOSITION.

Info

Publication number: DE156801T1
Application number: DE1983903332
Authority: DE
Inventors: J. Robert Berkeley Il 60163 Valenta
Original assignee: Packard Instrument Co Inc
Current assignee: Revvity Health Sciences Inc
Priority date: 1983-09-27
Filing date: 1983-09-27
Publication date: 1985-12-19
Also published as: FI852092L; FI852092A0; WO1985001584A1; EP0156801A4; EP0156801A1

Claims

TRANSLATION Application No. PCT / US83 / 01479 (WO 85/01584) Packard Instrument Company / Inc. claims

1. Radiation test instrument with:;

a solid state scintillator for providing pulses of photons due to interaction with the radiation; a photomultiplier tube for receiving the Photons from the scintillator and providing an electrical output signal;

a reflector device for collecting photons from the scintillator which otherwise would not impinge directly on the photomultiplier tube, and for redirecting them to the photomultiplier tube front; and
a circuit arrangement, the two parallel electrical

Has branches and contains.

In _{1 one.} First of the parallel electrical two-

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an integration facility for changing the pro

5.; '... fils of the electrical output signal that

is emitted through the photomultiplier tube, into a signal with smooth con-

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in a second of the parallel electrical two

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differentiating means for reducing each electrical output signal which through the photomultiplier tube is delivered, upon a sequence of component photon response pulses, the electr

form the output signal, and

a shock identification device for

; , Querying the sequence of the component photos

; ;. in response impulses and for

Output of a release signal with each opening

occur in a sequence that consists of more than one component photon response pulse,

■ that occur within a certain time interval, and
a pulse height analyzer for -

Receiving the signals with a smooth contour from \ the pulse integration device,

. Receiving the enable signals from the shock identifier and
Issuing an output count signal with each

Occurrence of a release signal and a corresponding signal with a smooth contour, its

Λ Pulse height fulfills special amplitude requirements.

2. The invention of claim 1, wherein the sequence of component photon response pulses consists of three pulses. .. ■■ '■

3. Method of testing radiation from a sample by:

Place the sample close to a solid-state scintillatof in order to Allowing radioactive particles from the sample to interact with the scintillator and thereby photons to create;

Collecting the photons with a photomultiplier tube to produce an electrical output signal; Dividing each such electrical output signal into at least first and second identical divided electrical output signals; Integrating the first divided electrical output signal to provide a smooth contoured signal; Differentiating the second divided electrical output signal to reduce the second signal to the sequence of component photon response pulses; Interrogating the sequence of component photon response pulses with a burst identifier to determine whether the sequence includes at least three components occurring within 750 ns;
Providing an enable signal by the burst identifier to a "pulse height analyzer" each time a second split electrical output signal is determined to have at least three component photon response pulses occurring within 750 ns; coordinating the arrival of an enable signal in the pulse height analyzer with the arrival of each signal having a smooth contour which the pulse height analyzer has determined to have a pulse height which meets preselected amplitude requirements; and providing an output count by the pulse height analyzer each time a pulse having a smooth

Contour is correlated with a release pulse

4. Radiation testing instrument with:

a solid state scintillator for providing pulses of photons due to interaction with the beam- -.5 "■ 'lung;■' -V ^ / i V ^."; _: /.:. '\' _; ^ \; ./. : \, - ■■ ■ a photoerectroneriver multiplier tube for receiving the photons from the scintillator and for emitting an electrical output signal;

a reflector device for collecting photons the scintillator ^: which otherwise would not be directly on the front of the photoelectron multiplexer tube would hit, and divert them to the photoelectric multiplier tube front; and a circuit arrangement, the two-parallel electrical Has branches and .; contains

in a first of the parallel electrical branches one Setup facility for changing the profile the electrical output signal emitted by the photoelectron multiplier tube, into a signal with a smooth contour,

■ ■ ■ .■ ..'.·>'Ι ^; .i"■ ■ ■. ■ .. '. ·>' Ι ^; .i "

in a second of the parallel electrical branches one Differential device to reduce each electrical output signal passing through the photoelectrony multiplier tube is delivered, to a sequence of component photon response pulse

sen, which form the electrical output signal, • ', ■ - and ■ /·';;.,,■ · ■■. . ■, ■■ · ■ ■ '■ "■■'

:. · ■■■■ a joint identification device for Query the sequence of component photon responses and .

Emission of an enable signal with each occurrence: of overlapping of the photon response pulses, the duration of which is greater than about 200 ns ■ '..'. is and
a pulse height analyzer for -

Receiving the signals with a smooth contour from the pulse integrator, Receiving the enable signals from the shock identifier and

Issuing an output count signal for each occurrence of an enable signal and one corresponding signal with a smooth contour, the pulse height of which has special amplitude requirements Fulfills.