SU728509A1 - Method of calibrating pyroelectric gamma-detectors - Google Patents

Description

It burns the power of impulse radiation and the method of its potassium; b.rovki is unVESTED. The closest to the invention in terms of essence is the method for calibrating the absorbed dose rate by comparing it with the power released in the electric calibration heater 2.

In this method, the low-inertia calorimeter of the integral heat flux consists of a thermocouple measuring probe, a radiation absorber, and an electric calibration heater. Considered theoretically and conducted experiment (1 talno question about the measurement of single

The subject of radiation energy release. This calorimeter can measure some parameters of single pulses. ,.,:.; .., ... ,,: The disadvantage of this method is to; that, firstly, the calorimeter does not give information about the pulse time parameters, since it is an integrator with a constant time t of several tens of seconds, secondly, measuring I1 radiation of different duration requires a special calibration of the calorimeter for each pulse duration more than 0.1 tons, of which can (be unknown or variable; thirdly, with pulse measurements, the accuracy is reduced compared with the stationary mode.

The aim of the invention is to provide a | absolute calibration and increase the measurement accuracy of pulsed gammases:

This goal is achieved by THAT al; ybr. on the absorbed dose rate of the liroelectric gamma detectors The comparison method with the power released in the electric calibration unit is carried out using the amplitude of the detector signal when exposed to the gamma-ray square pulse fronts, with indications of a calibration line, Calorimetric flame pattern, and a Metro pulse pattern. heat flow (it reaches the stationary operation mode for ITELA; and: Mpulsa, with the radiation absorber for 1 calorI1 meter; and

a calababrate pyroelectric detector, and a radiation pulse duration is chosen between 8 and 10 constant Kiorimeter time.

The calibration of the PDI is performed as follows.

An electric heater caliber 1 Calorimeter of the integral heat flux in a stationary mode according to a known method. Then an absorber (PDI) is placed in the calorimeter and installed. are exposed to radiation. At the time of the action of the pulse front in the PDI, a temperature change occurs and On it is allocated e728509

with a pulse signal U proportional to the radiation dose rate P

, A c

R,

and A is the area of the detection electrodes;

7 - pyroelectric coefficient; n - load resistance; C - specific heat capacity.

During the duration of the pulse, the readings of the H1a calorimeter are expected to become saturated (stationary-polar). After 8–10 constant times, the CID system is calibrated in the calorimeter and the radiation is removed. At this point, the second PDI signal of the opposite polarity is fixed.

Placing the probe into the calorimeter allows: firstly, to correctly measure and compare the signals of the PDI and the calorimeter, since the energy absorbed by the PDI body is simultaneously recorded both by the PDI itself and the surrounding measuring shell calorimeter. In this case, the nature of the interaction of radiation with the substance PDI, the conditions at the boundaries of the irradiating body and other physical processes that can contribute to the signal are automatically taken into account by this measurement technique.

Secondly, the impact of a pulse of radiation of a rectangular shape and wired power on a calorimeter with an absorber detector with a duration of more than 8-10 time constants, the calorimeter makes it possible to realize the conditions of the stationary mode of operation of the calorimeter and, therefore, to obtain high accuracy heat generation power.

The required experimental conditions are realized, for example, on any sake (meteoric installation with sufficient (fast input of the radiation source to the working position and its output.

Claims (2)

Invention Formula Calibration method of pyroelectric gamma detectors for the absorbed dose rate by comparing it with the power released in the calorimeter from an electric calibration heater, characterized in that, in order to ensure absolute calibration and to improve the accuracy of pulse gamma radiation measurement, a pyroelectric gamma detector and calorimeter are impacted by a square gamma pulse -radiated calibration is carried out by comparing the amplitude of the signal from the Ma-oradek signal with the indications of a pre-calibrated calorimeter when it reaches the steady-state range during an impulse duration, and JB hot leg 56 titer of radiation for the calorimeter iszpol-. USSR author's certificate This is a calibrated gaso-electric de no. 230914, cl. G 01 T 1/12, 05.09.64. tectzor ,. and the duration of the impacting gamma-ray pulse. choose large 2. Ogorodiyik S. S. and Tsaglin Yu. P. higher than the time constant of the calorimeter.5 About possible. networks of single measurements and sources of information received in “Atomic energy, t. 29, you; n; 5, s. 362, attention in the examination: 1970 (prototype). 728509 pyccd in radiation heat generation.