Table 3. Results of factor analysis of knowledge.
| Type | Question | Selected Rate(%) | SD | Factor 1 | Factor 2 | Communalities |
|---|---|---|---|---|---|---|
| B-1 | Depending on the type (nuclide) of radioactive materials, there are forms of radiation such as α ray, β ray, and γ ray, which have different levels of permeability etc | 34.8 | .48 | 0.793 | -0.106 | .520 |
| B-2 | There are two units used for radioactive substances in foods—Becquerel (Bq), representing the intensity of radiation and Sievert (Sv), representing the degree of influence on the human body | 36.3 | .48 | 0.745 | 0.000 | .554 |
| B-4 | Receiving radiation from radioactive substances outside the human body is called “external exposure,” and receiving radiation from radioactive substances taken into the body by ingesting air, water, food, etc. is called “internal exposure" | 39.6 | .49 | 0.651 | 0.089 | .515 |
| B-3 | When considering the influence of radiation on the human body, it is necessary to consider the physical half-life and the biological half-life of each radioactive substance | 26.0 | .44 | 0.614 | 0.112 | .487 |
| A-1 | In cities, towns, and villages where foods exceeding the standard value are confirmed, measures are taken to prevent the same foods from being shipped, distributed, or consumed | 47.9 | .50 | 0.574 | -0.107 | .253 |
| B-5 | Even in our daily lives, we are subject to “external exposure” and “internal exposure” to natural radiation (exposed to radiation at a global annual average of 2.4 mSv per person from global extraterrestrial cosmic rays, radon in the atmosphere, and natural potassium 40 from in food, etc.,) | 29.8 | .46 | 0.552 | 0.141 | .436 |
| A-6 | According to the inspection plan established by local governments, the results of inspection of pollution of agricultural land and crops are reflected | 16.2 | .37 | -0.078 | 0.662 | .370 |
| A-4 | The results of inspections conducted by local governments according to the inspection plan are published on the website of the Ministry of Health, Labor and Welfare | 15.7 | .36 | -0.015 | 0.630 | .384 |
| B-7 | It is said that if the additional dose received during a lifetime is less than 100 mSv, health effects are not clarified | 15.0 | .36 | 0.091 | 0.565 | .401 |
| A-5 | In the inspection using the radioactive cesium screening method, if the inspection result exceeds the screening level (generally 1/2 (50 Bq/kg) of the reference value), a higher-precision inspection is conducted (final inspection using germanium semiconductor detector) | 14.1 | .35 | -0.010 | 0.544 | .288 |
| B-6 | It is said that the risk of mortality from cancer will increase by about 0.5% if the additional dose received exceeds 100 mSv during a lifetime | 12.3 | .33 | 0.121 | 0.500 | .352 |
| A-7 | In the examination for FY2016, 0.03% of the total number of samples exceeded the reference value | 8.6 | .28 | -0.097 | 0.499 | .189 |
| A-3 | In accordance with the guidelines of the Nuclear Emergency Response Headquarters, local governments formulate inspection plans and conduct inspections | 24.2 | .43 | 0.106 | 0.472 | .306 |
| A-2 | The inspection of radioactive substances in foods is conducted mainly in 17 prefectures in eastern Japan. | 21.7 | .41 | 0.204 | 0.375 | .291 |
| Eigenvalue | 5.3 | 1.3 | ||||
A) Knowledge of food inspection, B) Knowledge of radiation