# US 4,395,634 A · Radiometric methods and means

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- Number: US 4,395,634 A
- Document ID: US4395634A
- Status: Granted
- Kind: A
- Application number: 06/211,919
- Filed: 1980-12-01
- Granted: 1983-07-26
- Earliest claimed: 1979-12-21
- Assignees: General Mining Union Corporation Limited
- Inventors: Rolf C. Bohme
- Web page: https://patentgrep.com/patent/US4395634A

## CPC

- G01T 1/20: with scintillation detectors
- G01T: MEASUREMENT OF NUCLEAR OR X-RADIATION (radiation analysis of materials, mass spectrometry G01N23/00; tubes for determining the presence, intensity, density or energy of radiation or particles H01J47/00)

## Abstract

Apparatus for measuring the radio-active emission from a particle including a housing, a plurality of elongated scintillation crystal radiation detectors in the housing with their axes parallel to each other to define between them a passage for the particle to be measured, an elongated photomultiplier attached to each detector with its axis parallel to that of the detector, light transmitting means joining the multipliers to their detectors and means for connecting electronic measuring means to the multipliers.

## Claims

### Claim 1

Apparatus for measuring the radio-active emission from a particle including a housing, a plurality of elongated scintillation crystal radiation detectors in the housing with their axes parallel to each other to define between them a passage for the particle to be measured with the passage extending in a direction which is parallel to the axes of the detectors, an elongated photomultiplier attached to each detector with its axis parallel to that of the detector, light transmitting means joining the multipliers to their detectors and means for connecting electronic measuring means to the multipliers.

### Claim 2 (depends on 1)

Apparatus as claimed in claim 1 in which the light transmitting means comprises a plurality of optical prisms respectively associated with each photomultiplier and detector, with each prism being attached to the detector and multiplier and adapted to transmit light emissions from the detector to the multiplier.

### Claim 3 (depends on 2)

Apparatus as claimed in claim 2 in which each prism is wider than the cross-sectional dimension of the detector and its multiplier and is octagonal in shape in a direction transverse to the axes of the detector and multiplier.

### Claim 4 (depends on 3)

Apparatus as claimed in claim 3 in which the prisms of the detectors which define the passage abut each other.

### Claim 5 (depends on 1)

Apparatus as claimed in claim 1 in which the housing is a lead tunnel.

### Claim 6 (depends on 5)

Apparatus as claimed in claim 5 in which the lead wall on the inside of the housing is lined with a liner which is made from a lead which has a lower level of radio-active emission than the lead of the tunnel.

### Claim 7 (depends on 5)

Apparatus as claimed in claim 5 in which the lead wall on the inside of the housing is lined with a metal having a lower atomic number than lead.

### Claim 8 (depends on 7)

Apparatus as claimed in claim 7 in which the detectors, their multipliers and prisms are held in position in the housing between two concentric aluminium sleeves with the radially inner sleeve providing a liner for the passage through the housing.

### Claim 9

A detector for detecting radio-active emissions from material carrying radio-active products including, an elongated scintillation crystal detector, an elongated photomultiplier, means holding the multiplier to the detector with its axis parallel to that of the detector and light transmitting means connecting the multiplier to the detector.

### Claim 10 (depends on 9)

A detector as claimed in claim 9 in which the light transmitting means is an optical prism which is adapted to transmit light emissions from the detector the the multiplier.