Physica Medica: European Journal of Medical Physics - Volume 32 - Supplement 1 - February 2016

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perimental treatment protocols and cannot therefore be recommended for
introduction into the A.S.P.
F.462
ASSESSMENT OF WORKERS’ EXPOSURE DUE TO BLUE-LIGHT NEONATAL
PHOTOTHERAPY
C. Spadavecchia * C. Pasquali R. Villa C. Ghezzi N. Paruccini
A. Crespi a Scuola di Specializzazione in Fisica Medica, UNIMI, Milano, Italy;
b A.O. San Gerardo, S.C. Fisica Sanitaria, Monza, Italy
Introduction: Phototherapy is used for neonatal jaundice to decrease bili-
rubin level in blood: light converts bilirubin molecules into water soluble
isomers that can be excreted by the body.
The objective of this study was to assess workers’ exposure to Artificial
Optical Radiation, according to D.L.81/08.
Materials and Methods: Spectral irradiances were acquired on 8 light-
emitting diodes (LEDs) neonatal systems with the HD2000+
spectroradiometer, operating in the 200–1100 nm wavelength-band.
These measurements were performed both in high and low intensity
regimen, under the LEDs and in worker typical position (on the side of
infant’s bed) with the lamp covered and uncovered by a blanket attenu-
ating light.
Effective radiances were calculated using the spectral weighting func-
tions for retinal thermal and blue-light hazard then averaged on the 8
systems.
The direct spectra displayed a peak around 460 nm (blue region), corre-
sponding to the wavelength of maximum absorption of light by bilirubin
(458 nm).
Results: In worker position using blanket, retinal thermal radiances Lr were
19.26 and 8.40 W/(m2sr) in the high and low intensity regimen respec-
tively, to be compared with the Lr recommended limit of 280,000 W/(m2sr).
Values of the blue-light radiances Lb were 1.90 (high) and 0.81 (low)
W/(m2sr) with a limit of 100 W/(m2sr).
Conclusions: The results fully complied with the recommended limit levels.
The presence of a blanket covering the source reduced values of radiance
by almost 60%, confirming its use as a valid protective measure guaran-
teeing workers’ safety.
F.463
ELECTROMAGNETIC FIELDS OF A NEW FERROMAGNETIC SURGICAL
SYSTEM
R. Villa C. Spadavecchi C. Pasquali G. Montanari A. Crespi
a Scuola di Specializzazione in Fisica Medica, UNIMI, Milano, Italy; b A.O. San
Gerardo, S.C. Fisica Sanitaria, Monza, Italy
Introduction: FMwand is a new ferromagnetic surgical system which con-
sists of a power generator and a handle: the energy is used to excite a
ferromagnetic coating at the tip of the handheld FMwand, producing rapid
heating to simultaneously cut and coagulate soft tissue.
Materials and methods: The system operates at 40.68 MHz, a frequency
considerably higher than the typical ones of electrosurgical devices, and
has a closed loop energy circuit, that eliminates the need for a remote
grounding electrode and the passage of electric current through the patient’s
body.
Effective electric fields (ERMS) were measured with NARDA PMM 8053B
electrometer and EP330 field-probe. To have a comparison with a stan-
dard monopolar electrosurgery, ERMS were also acquired for Martin ME402.
ERMS were measured near the handheld and along the outspread cable every
75 cm, on contact and at a distance of 5 and 10 cm. The typical and the
highest power (30/60 W for FMwand, 100/360 W for Martin) were set on
the power generator.
Results: Measurements confirmed that the cable is the main source of elec-
tric field, without correlation between the position along the cable and the
intensity of field.
ERMS decreased with the increasing of the distance from the cable.
Comparing the two systems, FMwand was characterized by an emitted ERMS
equal to 20% of the correspondent value acquired with the standard
monopolar electrosurgery Martin ME402.
Conclusions: With the FMwand we obtained electric fields much lower than
a standard electrosurgical device, which is in agreement with some clin-
ical studies reporting that the system reduces electromagnetic interference
with cardiac implantable electronic devices (CIEDs), such as permanent pace-
makers and implantable cardioverter defibrillators.
e137 Abstracts/Physica Medica 32 (2016) e135–e137