Radiation handler education andtraining
Class Aー Safe handling（topics）ー

Points１

Before handling＞＞＞ Danger prediction

Understand the behavior of RI and radiation to handle
Estimate the exposure dose associated with radiation work

２

Under handling＞＞＞ Reduce exposure dose

External exposure：Three principle protection（Distance・Time・Shield）
Exposure dose measure by radiation measurement

Internal exposure：Identification of using place（Prevention of contamination expanding）
Wearing protective equipment (gloves, lab coat, mask)
３

After handling＞＞＞ Decluttering

Storage of RI, shutdown of radiation generator

Decluttering the place of use (including contamination inspection)
Submission of usage record bookStrict adherence to reduce exposure dose
１２
３

Check the bulletin board (various precautions).
Use an appropriate shield in consideration of the type, energy,and radioactivity of radiation.
Secure the distance from the radiation source.

４ Check the dose using a survey meter（Max 25μSv/h (1mSv/W))
５ Check the exposure dose using a glass badge and an auxiliary dosimeter(pocket dosimeter)

Exposure dose estimation●External exposure【Question a】
Find the exposure dose for one year when working 40
hours a week at a place where the survey meter shows
0.5 (μSv / h).
【Answer】
Per a week：0.5(μSv/h) ×40(h/w)＝20(μSv/w)

Per one year：20(μSv/w) ×52(w/Y) ＝1040(μSv/Y)＝1.04(mSv)Exposure dose estimation●External exposure【Question b】
Find the effective dose rate at a distance of 1 m
from the surface to which Cs-137 adhered 50000 (Bq).
1 cm dose equivalent constant of Cs-137 ;0.0963(μSv・h-1・MBq-1・m2)【Answer】
0.0963×50000(Bq)×10-6／12(m)＝0.0048(μSv/h)Exposure dose estimation●External exposure【Question c】
20000 (Bq / cm2) adhered to the skin when it touched
the sample contaminated by P-32. Find the absorbed
dose rate of the skin.
The absorbed dose rate of the skin per 1 (Bq / cm2)
of P-32 is 1800 (nGy / h).
《β ray contribution》
1800(nGy・h-1・Bq-1・cm2)×20000(Bq/cm2)＝
36(mGy/h)What is the equivalent dose rate for this skin?
β ray radiation load factor: From 1,28(mGy/h)×1＝28(mSv/h)Absorbed dose rate of skinContamination area

Maximum β ray energy (MeV)

Relationship between maximum β-ray energy andskin absorbed dose rate
出展：緊急被ばく医療研修HP

Exposure dose estimation●Internal exposure【Question】
Find the effective dose when I-125 in the air isinhaled at 500 (Bq) per year.
Effective dose coefficient when I-125 is inhaled：
1.4×10-5(mSv/Bq)【Answer】
1.4×10-5(mSv/Bq)×500(Bq) ＝7×10-3(mSv)=7(μSv)

IVIS：In Vivo Imaging System
XENOGEN (PerkinElmer)• Ultra-sensitive low noise cooling CCD camera– 27×27mm square CCD, 2048×2048 pixels• Imaging system for small animals– Fluorescence, light emission,
Cherenkov light– Anesthesia system– Heating stage• Software(Living Image)

CCD

IVIS Spectrum
Anesthesiasystem

in vivo imaging method• Fluorescence– Use fluorescent proteinssuch as GFP andfluorescent probes

Excitation light(Lamp or laser)

Detector• light emission– Use luciferase, etc.
– The luminescence has hightissue permeability, highsensitivity and excellent
quantification.

• Cherenkov light– Imaging of charged particles
target– Animal testing of radioactive drugs

BioluminescentsourceWavelength in the visible light region⚫ 700-900nm is called Medical
Spectrum Window and is awavelength of light suitablefor in vivo imaging.
⚫ Red light (> 600 nm) easily
passes through tissue
Real photoLightemission

Fluorescence