Study type: Medical/biological study (experimental study)

Complex high-frequency technology for protection of grain against pests med./bio.

By: Mishenko AA, Malinin OA, Rashkovan VM, Basteev AV, Bazyma LA
Published in: J Microw Power Electromagn Energy 2000; 35 (3): 179-184
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Aim of study (acc. to author)

To create high-frequency technology for treatment of grain to kill warehouse pests.

Background/further details

The technologies investigated for disinfestation and disinfection of grain are based on irradiation of grain by modulated pulses of radiofrequency electromagnetic fields and on simultaneous action of a complex of factors: vacuum and radiofrequency field induced plasma discharge.

Endpoint

Exposure

Exposure Parameters
Exposure 1: 47.5 MHz
Modulation type: pulsed
Exposure duration: continuous for 5, 10, 20 and 60 s
Exposure 2: 47.5 MHz
Modulation type: pulsed
Exposure duration: continuous for 60 s
Exposure 3: 900 MHz
Modulation type: CW
Exposure duration: continuous for 5, 15, 30 and 60 s
-
Exposure 4: 2,450 MHz
Modulation type: CW
Exposure duration: continuous for 60-90 and 120 s
-
Exposure 5: 10 MHz
Modulation type: CW
Exposure duration: continuous for 3, 5, 10 and 20 s
-

Exposure 1

Main characteristics
Frequency 47.5 MHz
Type
Exposure duration continuous for 5, 10, 20 and 60 s
Modulation
Modulation type pulsed
Pulse width 0.5 ms
Repetition frequency 2 Hz
Exposure setup
Exposure source
  • RF generator, "wave-pass tube"
Parameters
Measurand Value Type Method Mass Remarks
electric field strength 3.5 kV/cm - - - -
Additional parameter details

radiating power of 0.940 J/cm² in a pulse

Exposure 2

Main characteristics
Frequency 47.5 MHz
Type
Exposure duration continuous for 60 s
Modulation
Modulation type pulsed
Pulse width 0.5 ms
Repetition frequency 2 Hz
Exposure setup
Exposure source
Parameters
Measurand Value Type Method Mass Remarks
electric field strength 1.8 kV/cm - - - -
electric field strength 2.8 kV/cm - - - -
electric field strength 3.5 kV/cm - - - -
Additional parameter details

radiating power of 0.245, 0.615 and 0.940 J/cm² in a pulse

Exposure 3

Main characteristics
Frequency 900 MHz
Type
Exposure duration continuous for 5, 15, 30 and 60 s
Modulation
Modulation type CW
Exposure setup
Exposure source
Parameters

No parameters are specified for this exposure.

Additional parameter details

specific radiating power of 2.3-2.8 W/cm³

Exposure 4

Main characteristics
Frequency 2,450 MHz
Type
Exposure duration continuous for 60-90 and 120 s
Modulation
Modulation type CW
Exposure setup
Exposure source
Parameters

No parameters are specified for this exposure.

Additional parameter details

specific radiating power of 0.8-1.1 W/cm³

Exposure 5

Main characteristics
Frequency 10 MHz
Type
Exposure duration continuous for 3, 5, 10 and 20 s
Modulation
Modulation type CW
Exposure setup
Exposure source
  • RF generator, treatment cell with evacuated gas discharge zone
Parameters

No parameters are specified for this exposure.

Additional parameter details

Various generator currents between 0 and 100% were tested, their values increasing with falling exposure durations.

Exposed system:

Methods Endpoint/measurement parameters/methodology

Investigated system:
Time of investigation:
  • after exposure

Main outcome of study (acc. to author)

The threshold value of the electric field intensity for total insect mortality was revealed to be E = 4.0-5.0 kV/cm in the pulse mode at the base frequency of 47.5 MHz. The highest degree of influence on biological systems can be reached when plasma discharge is used which is formed in vacuum under the action of the radiofrequency electromagnetic field.

Study character:

Study funded by