Ingabe ukuvezwa kwemisebe kungakunika umdlavuza? Impendulo emifushane inguyebo. Ngokusho koMnyango wezeMpilo waseMelika kanye nezinsizakalo zabantu, umdlavuza wekoloni ubangelwa ukulinganisa kwama-millisieverts angaba ngu-1 000 (mSv). Ukuvezwa okungaphansi kuka-200 mSv kungabangela i-leukemia nomdlavuza we-thyroid, isifuba nephunga. Futhi umdlavuza wesibindi ungabangelwa ukuvezwa kwemitha engaphansi kuka-100 mSv.
Okuyisisekelo
Ngakho-ke, yini oyithandayo "i-millisievert" futhi uqhubeka kanjani ukugwedla ama-100, 200, noma angu-1,000 kuwo? I-millisievert iyunithi yesayense yokulinganisa i-radiation dose. Njengoba izingxenye ezahlukene zomzimba zinamazinga ahlukene okuzwela emisebeni, ukuvezwa ngokuvamile kuboniswa ngokuthi "umthamo osebenzayo." Isibonelo, asho ukuthi i-Organ X ne-Organ Y ngayinye idalulwe ku-10 mSv yemisebe. Noma kunjalo, i-Organ Y iphindwe kabili. Umthamo wangempela uzoba yi-10 mSv ngayinye yomzimba, kodwa umthamo ophumelelayo uzoba ngu-10 mSv we-Organ X no-20 mSv ye-Organ Y.
Izindaba ezimbi
Izindaba ezimbi ukuthi cishe ukufika kwe-radiation engaba ngu-80% kuvela emithonjeni yemvelo, engenakugwemeka. Umphakathi waseMelika uthola umthamo osebenzayo wezingu-3 mSv zemisebe minyaka yonke kusuka ku-radon, amadwala, isikhala sangaphandle, inhlabathi, i-electronics, kanye nokuhamba kwezindiza. (Ngaphambi kokuba ufungise izindiza, khumbula ukuthi uthola cishe 1 mSv yokuchayeka njalo emahoreni angu-200 ngesikhathi sokuhamba.)
Izindaba Ezinhle
Izindaba ezinhle ukuthi kuthatha ukutholakala kwemisebe eminingi ukufika emazingeni abangela umdlavuza . Uma wazi izinombolo, ungagwema ngokungadingekile emithonjeni eyengeziwe yemisebe. Isibonelo, uma ukhathazekile ngokuchayeka kwemisebe, ungase uthande ukukhetha ukuba ne-colonoscopy (akukho ukuvezwa kwemisebe) esikhundleni se-enam ye-barium (cishe i-7 mSv ye-radiation exposure).
Amanani okwenza imithombo ejwayelekile yemisebe ihlanganisa okulandelayo:
- Ukuhamba kwezindiza (0.005 mSv / ihora)
- I-Barium enema (7 mSv)
- I-X-ray yesifuba (0.10 mSv)
- I-CT scan yesisu (10 mSv)
- I-CT scan yesifuba (8 mSv)
- I-CT scan yekhanda (2 mSv)
- I-X-ray yamazinyo (0.09 mSv)
- I-Mammogram (0.7 mSv)
- I-X ray ye-skull (0.07 mSv)
- Isisindo somzimba wonke we-CT (10 mSv)
Imithombo:
I-Nordenberg, iTamar. Isithombe Sempilo: Yikuphi Okungaphakathi Okubhekana Ne-X-ray, Ezinye Izindlela Zokufanisa. Ukuphathwa kwe-US nokuDrug. Feb. 1999. 27 Aug. 2006 [http://www.fda.gov/fdac/features/1999/199_xray.html].
Ukuboniswa kwemisebe ye-X-ray Imibuzo. Ulwazi lwe-Radiology. 27 Aug. 2006 [http://www.radiologyinfo.org/en/safety/index.cfm?pg=sfty_xray].
Ukulimala komsindo. I-Merck Manual yezokwelapha. 1 Febhuwari 2003. 27 Aug. 2006 [http://www.merck.com/mmhe/sec24/ch292/ch292a.html].
Bika ama-carcinogens, i-11th Edition. Isevisi yezempilo yomphakathi. 27 Aug. 2006 [http://ntp-server.niehs.nih.gov/ntp/roc/toc11.html].
Yiziphi Izinhlekelele Zomshuwalense kusuka ku-CT? Isikhungo samadivayisi kanye nempilo yezokwelapha. 4 Meyi 2005. 27 Aug. 2006 [http://www.fda.gov/cdrh/ct/risks.html].