# US 4,381,450 A · Pulsed radiation dosimetry apparatus

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- Number: US 4,381,450 A
- Document ID: US4381450A
- Status: Granted
- Kind: A
- Application number: 06/227,558
- Filed: 1981-01-22
- Granted: 1983-04-26
- Earliest claimed: 1981-01-22
- Assignees: The United States of America as represented by the Secretary of the Air Force
- Inventors: John R. Cappelli
- Web page: https://patentgrep.com/patent/US4381450A

## CPC

- G01T 1/026: {Semiconductor dose-rate meters}
- 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

A pulsed radiation dosimetry apparatus utilizing a pin diode to detect pulsed radiation that may be produced by either a particle accelerator or a flash x-ray device. The detected radiation signal is integrated and then directly displayed on a digital meter. The present apparatus provides a direct readout of radiation dose in rads.

## Claims

### Claim 1

A pulsed radiation dosimetry apparatus comprising in combination:
a radiation detector means to receive a pulsed radiation signal, said radiation detecting means providing a voltage signal in response to said pulsed radiation signal,
an attenuator means receiving said voltage signal from said radiation detector means, said attenuator means providing more than one level of attenuation,
an integrator means receiving said voltage signal from said attenuator means, said integrator means integrating said voltage signal and providing a ramp signal in response thereto,
a sample and hold means receiving said ramp signal from said integrator means, said sample and hold means sampling and holding said ramp signal for a predetermined length of time, said sample and hold means providing a dose rate signal,
a gate driver means receiving a trigger signal, said trigger signal being coincident with the test of said pulsed radiation signal, said gate driver means providing a first and second control signal, said first control signal enabling said sample and hold means to sample and hold said ramp signal, and,
a display means receiving said dose rate signal from said sample and hold means, said display means receiving said second control signal from said gate driver means, said second control signal enabling said display means to continuously display said dose rate signal.

### Claim 2 (depends on 1)

A pulsed radiation dosimetry apparatus as described in claim 1 further including a switch means to provide either single or multiple pulse operation, said switch means being connected between said gate driver means and said display means.

### Claim 3 (depends on 1)

A pulsed radiation dosimetry apparatus as described in claim 1 wherein said radiation detector means comprises in combination:
a pin diode to receive said pulse radiation signal, and,
a resistor in series with said pin diode between a positive voltage supply and ground, said resistor having a predetermined voltage across it, said voltage across said resistor changing in response to said pulse radiation signal which is received by said pin diode.

### Claim 4 (depends on 1)

A pulsed radiation dosimetry apparatus as described in claim 1 wherein said integrator means comprises an operational differential amplifier which is arranged in an integrating configuration.

### Claim 5 (depends on 1)

A pulsed radiation dosimetry apparatus as described in claim 1 wherein said gate driver means comprises a first and second multivibrator, said first multivibrator generating said first control signal and said second multivibrator generating said second control signal.

### Claim 6 (depends on 1)

A pulsed radiation dosimetry apparatus as described in claim 1 wherein said sample and hold means proides a sampling time of at least six microseconds.

### Claim 7 (depends on 1)

A pulsed radiation dosimetry apparatus as described in claim 1 wherein said predetermined length of time may be varied from six microseconds to infinity.